Showing posts with label Giant petrel. Show all posts
Showing posts with label Giant petrel. Show all posts

Tuesday, 20 August 2013

Family days out


During the winter we have taken advantage of the lower work load to have a few “family days out”, when we shut down the base and go out for the day. The first one wasn’t a day out but just a few hours out one evening. Taking advantage of the snowy conditions we hiked up the hill to the peak of Gazella (which overlooks the base). It was my first time up there, as I wanted to save a few places on the island to experience for the first time in the winter.  Jerry, Hannah and myself were joined by Craig who decided he didn’t want to be left alone. We climbed over the crest of Gazella and had an impromptu snowball fight on the edge (well it was Hannah and I against Jerry, and he wasn’t really throwing any snowballs). After spending some time watching for whales off the North Cliffs and admiring the views, we headed down the hill into Wanderer Valley where we saw an all white Giant Petrel (know by us as a Spirit Geep). It was sporting a GLS tracker, but we were too slow to catch it and retrieve the data. Maybe next time! 
After summiting Gazella we paused for a photo in front of La Roche the highest peak on the island (Photo by Craig Brown).

Snow ball fight! I got this one dead on! (Photo by Craig Brown).
On the way back we went to see a few Wandering albatross chicks, and I managed to fall in a bog twice, which is a pretty usual occurrence. It’s pretty dangerous walking around the island with snow covering the ground as you can’t see the numerous holes and bogs that can easily swallow you up to your waist. 

A halo going over the bay
Heading through the snow to the east of the island (Photo by Craig Brown).
Our second trip was a full day affair when we left the base and headed to the eastern end of the island, which is rare to say the least for most of us. The only work done on that side of the island is the monthly Wandering Albatross census so it is a very under visited area.  Again there was a fair amount of snow on the ground which led to Jerry falling thigh deep into a bog, but we soldiered on and eventually got past the worst boggy areas. The eastern side of the island is different in that the terrain is a lot more rocky and involves traversing scree paths high up the hill. We headed down the hill to Natural Arch (another place I hadn’t been to before, mainly due to the large number of Fur seals around earlier in the season). We had lovely views of the South Georgia mountains just across Bird Sound (the small stretch of water that separates us from the mainland). There were a few penguins about and one inquisitive King Penguin very nearly decided to make friends with me, but finally decided I was a bit too weird looking and waddled off. We had a picnic on the beach, but didn’t hang around too long as it was very cold. We then traversed along some icy streams, luckily we all had our trusty spikes on, and followed the coast back towards home. 

Natural arch- it was cold! (Photo by Jerry Gillham).
South Georgia mountains through Natural Arch
After exploring the coast for a while we had a long trudge back up to the scree path high above. We went through deserted penguin colonies, which seem ridiculously far from the water and eventually made it back to the path. It was such a nice day that I decided to go up Gandalf, one of the higher peaks on the island. Everyone else decided to join me, and after a little bit of a struggle made it to the peak, where we could simultaneously see the South Georgia mountains as well as looking down over the North Cliffs of the island. The descent mainly involved sliding down the hill, which was great fun but resulted in ripped trousers, and in some cases skin damage from the rocks. We managed to get up some impressive speed heading down some parts, which was at times a bit scary. We all got home relatively unscathed after a great day out. 
The view from the top of Gandalf looking West- Hannah and Craig are in the picture climbing up but it's hard to see.

Hannah on the summit of Gandalf, it's a long way down!
Hannah and I on Gandalf (Photo by Craig Brown).
Our next foray was to the opposite end of the island, with a hike along the beaches, checking for Leopard seals on the way, and then up and over the hill to Johnson Beach. It is the largest beach on the island and seems to be a favourite haunt of Gentoo penguins. The route to Johnson is around the cliffs and requires some well timed dodges between waves. luckily for us the tide was fairly low so none of us ended up with wet feet. There were lots of Gentoos hanging out on the beach (a few hundred at least ) and we went to the place where you get the best view of it all, Johnson Stack.  Looking at it from the beach it just looks like a tall stack of rock with no possible route up (unless you had ropes and at least some proficiency in climbing. However if you can manage to get around the back (only possible in calm conditions at low tide), then you can scramble up to the top. We paused on top to have a few snacks and to take some pictures whilst admiring the view. 
The four of us on the top of Johnson Stack with Gentoo penguins on the beach in the background.

On the way down we spotted a very strange looking Fur seal, it was a sandy brown colour with spots; very different to all of the other Fur seals on the beach. We went a bit closer and Hannah declared it to be a Brindle fur seal. It was a young male seal and seemed happy chilling out on the rocks, I managed to get a few photos of it. Whilst sitting on a rock on the beach I noticed a number of penguin shaped shadows coming up behind me, and just standing there. A quick glance behind revealed a gang of about eight Gentoo penguins slowly creeping up and looking and Jerry and I inquisitively. They soon got bored of us and wandered over to see what Craig was up to taking photographs of some of their compatriots. 

Strange looking Brindle Fur Seal
Watching penguins can be hilarious for no apparent reason one will suddenly start flapping it’s wings madly and honking at the sky, and then starts running around. It seems to be contagious behaviour as often others around it will start joining in. I  could sit there for hours watching them, and can’t wait until they start nesting again, and we have tiny chicks to amuse us. We walked back up over the top of the island back towards base, and had chance to see lots of my Wandering Albatross chicks that are getting ever bigger and are now as large as their parents. 
Gentoo Penguins on Johnson beach

The final trip was not a complete family day out as Craig had to stay behind to mind the generator which has been playing up after having some new parts fitted. We again headed over to the Eastern side of the island and this time went all the way to the end of the island called Farewell Point. There is one lonely chick living out there, so we sat and gave him a bit of company while we had some snacks and then climbed over to the end of the island to look over the cliffs to see if we could spot any Elephant seals in the water below. 

Jerry and I in front of one of the scree paths (photo by Hannah Wood).
 I always like heading out over to that part of the island as you get lovely views of South Georgia and the water is so blue, it almost looks tropical. On the way back we played in the snow, sliding down the hills in ever more extreme ways. When we were nearly back at base we saw two Giant Petrels mating, a sure sign that spring is on its way, although they are definitely a bit early to be thinking about nesting, I guess they are just keen. Up on Wanderer Ridge lots of adult albatross were back and were busy feeding chicks, or spending time preening each other and ignoring their chicks begging calls for more food. The chicks are absolutely insatiable, even before the parent has managed to sit down after regurgitating one lot of nutrition food, the chick is already begging and tapping the beak of the adult. It’s tiring work being a parent!

Friday, 26 July 2013

Tsunami's and Leopard seals- a dangerous combination


From the beginning of May Hannah (seal scientist) has been on the look out for leopard seals. They only come to Bird Island during the winter season as they prefer cold weather. Every day when I went to colony H Black-browed albatross colony I would scan the beaches to see if I could spot one, but no luck. After spending 6 months on the island it felt strange that a “new” species might turn up, so I was never really expecting to see one. One afternoon I was over at colony E (the other side of the island) weighing some Grey-headed albatross chicks with Jerry when I heard a radio message from Hannah saying that there was a leopard seal on Main Bay, and it was huge! I had a busy day ahead of me checking my various colonies so I was praying that it was a tired leopard seal and would still be napping on the beach a few hours later.
A panoramic view from up the hill, a site I see almost every day

I actually had a really enjoyable day, mainly due to the nice weather, and after visiting the usual colonies headed over to a new part of the island. Every year we have to count the Grey-headed albatross chicks in certain colonies to see how successful a breeding season it has been. One of the colonies I had never been to before so it was a bit of a guessing game trying to figure out which group of chicks I was supposed to be counting. To get there I had to head out onto Johnson point which is not somewhere I usually have to go. I had to walk down the stream (which was useful as I found a couple of ringed Black-brow chicks that hadn’t made it) and up the hill towards the end of the island. It was nice to see the areas I usually spend my time in from a different perspective. 
Wandering albatross family- the chicks are getting big!

From the end of the island I saw lots of different birds including; giant petrels, all four albatross species, Cape Petrels, Skua’s and lots of Blue eyed Shags. It’s nice to see the Wanderers out amongst the waves, gliding effortlessly in between waves, and somehow never managing to get splashed. I had a brief sit down and had a snack whilst taking in the bird life and watching the waves pound the coastline. 

It had been a few hours since I heard about the leopard seal, but luckily for me it was still lying on the beach. From up the hill it looked like a huge smooth grey rock, but when I got a bit closer I could make out some flippers and a head. It was fast asleep lying on its side. I took a few photos but didn’t want to get too close and only had my compact camera with me. Hannah came over to do some more observations so I left her to it, and headed home after a long day. 

Max the leopard seal
The seal already had flipper tags, so we knew it was one that had been at the island previously, and it also had a GLS tracker attached to one of the tags. Hannah managed to get it back, which is very exciting, as it is only the fourth tag retrieved in 10 years. Not much is known about where these seals spend the rest of the year, so every tag retrieved provides valuable data. 

Leopard seals can be identified from the patterns of spots and markings on their skin, so Hannah has to take photographs of all the seals she sees and uploads them to a database to be identified.  The seal seen was identified as Max, a young male leopard seal, who had been seen at the island last year. He didn’t look like a young seal to me as he was huge! Over 3 metres long with a huge powerful head. 

The following day he was spotted out of the water again, so I headed over to take some more photographs, and I got to help Hannah measure him, which you do when he is asleep. He kept waking up because a Sheathbill kept pecking at a big wound on his back (which could have been caused by a male Antarctic Fur seal. It looked very sore, and he was not impressed by the bird, but couldn’t quite manage to grab it before it ran away. 

Max getting annoyed at a Sheathbill that is making a hasty exit
Since then Max has been seen in the water a couple of times feeding. It is obvious when he has made a kill as he is surrounded by a cloud of Giant Petrels and Cape Petrels, looking to grab a piece of his leftovers. It is hard to tell what he is eating as it’s usually below the surface, and leopard seals have a tendency to turn its prey inside out to eat it more easily. It seemed most likely that he had a young fur seal, and possibly a penguin on another occasion. 

Max showing just how big that mouth is- apparently they have a head bigger than a Grizzly bear
A few days after the first sighting of Max, another leopard seal turned up. At first we thought it was Max as it was seen in the same area that he had been feeding in. Looking back at the photos taken Hannah noticed that there was a distinctive S shaped marking on its face. It was definitely not Max. Looking back through the records the seal was identified as Stephanie; a female seal that had first been identified on the island in 2007. I haven’t yet seen her myself but I am hoping to see her soon. 

Leopard seals are not the only exciting species to have been spotted this month. Hannah spotted a Southern Right Whale while doing her daily Leopard seal rounds. It was showing well so I went up to join her and watched it for around half an hour feeding just off the island. Southern Right Whales can be up to 16.4 metres long and can weigh as much as 30 tonnes. I’m not sure how big the one we saw was, as it is hard to estimate but it looked pretty big. Earlier in the season they were spotted regularly around the island, but this was the first individual seen for some time. All records of whales are noted down for our annual report. In other years Killer Whales have been seen off the island, but very rarely.  

South Georgia Pipit
All of the Black-browed Albatross chicks have now fledged, and it is the turn of the Grey-headed Albatrosses. The first chick disappeared on the 14th May, and I will be checking the study colony every day until the last one goes (which could be as late as the 17th June). The mortality rate seems to be higher than the Black-browed Albatross chicks, and recently I have been finding dead chicks which when weighed only a few days previously seemed healthy. The only explanation seems to be that Giant Petrels and Skuas are killing chicks, as there is very little food around for them. On the last two occasions that I have been to the colonies I have seen both Giant Petrels and Skuas feeding on dead chicks. Hopefully a good proportion of the remaining chicks will fledge soon, and not become dinner for the other birds. 

Fully grown Giant Petrel chicks- smart birds!
Last week we had an unusual start to the day when the emergency phone started ringing early in the morning. I jumped out of bed to answer it and it was Les back in Cambridge. He was phoning to tell me that there had been a tsunami alert for South Georgia, and it was due to hit in 20 minutes. We had to evacuate the base (which is on the beach) and head to higher ground. I quickly woke everyone up, and we all got kitted up in warm clothes and headed up the hill to wait. It was pitch black outside so we all took torches, and once we had gotten far enough up the hill we sat down in the snow to wait. We had taken an iridium (satellite) phone with us, so we could call Cambridge when we were in a safe place. In the end we stayed up the hill for around an hour before being allowed back down to the base. Luckily the tsunami didn’t materialise, but it was still a scary few minutes when we were getting ready to leave the base. We later learned that there had been an earthquake in the South Sandwich Islands which was fairly shallow, and so could have triggered a tsunami. 

Another task this month was to go and check all of the Light-mantled Sooty Albatross nests that had been found earlier in the season to see if the chicks had survived. It was dire news though, not one chick was found out of an initial 75 nests. It’s hard work to check the nests as they tend to be on cliffs around the coastline which are not easily accessible, and requires you to battle the huge tussac grass. A few months ago I did the same survey with Jenn, to check if the nests had progressed to having chicks. It wasn’t all bad though, as it was a lovely cool frozen day, with nice views of South Georgia. I hadn’t been over to that side of the island for ages, so it made a welcome change. 

View over to South Georgia whilst doing the Sooty census
The number of skuas across the island has been decreasing over the last couple of months. We used to have large numbers of them on the beaches, and you would see them  constantly washing themselves in the streams. They seem to have a serious case of OCD when it comes to bathing! Recently though we only have a few left that hang out around base. One of them is likely to be a permanent resident as he has an injured wing which doesn't seem to be getting any better. He waits outside the door for you and then follows you around hoping to get a bite to eat. Sometimes he's lucky and we are taking the "gash bucket" (slops bucket) out, and he often gets first dibs. We have called him Scratchy, as has very sharp claws. I learnt that when we were examining his injured wing and he managed to slice my finger open.

Scratchy the resident Skua
This month we have been recreating the television programme Come Dine with Me. Each Saturday it is the turn of another Bird Island resident to prepare a three course meal and entertainment for the others. Craig is hoping to make a film out of it once we've finished. The last "episode" is this Saturday, so I'll let you know how it all goes.


Gentoo penguins having a disagreement, the one on the left had walked up and yanked the tail of the other one.












Thursday, 25 July 2013

Birds, birds, birds!


I realise that I’ve been absolutely awful at updating the blog recently, which I apologise for. Even though we are now in the middle of winter, I’ve been pretty busy. A fair amount of things have happened in the last month and a half. I’m going to split it up into different sections, so this isn’t just one mammoth post.
The first one is going to be about the birds on the island.

 There has been even more change with the complete departure of the Grey-headed Albatross chicks. They finished just before mid winter on the 20th June. Compared to last year they were fledging a lot later, which meant more daily trips to the colonies. It was strange going up to colony B for the last time which overlooks Big Mac penguin colony. Both were completely empty and silent; so different from the main season when the noise of the penguins can be heard over a kilometre away, and the albatross chicks are begging for food, and the adults are chattering amongst themselves. However although I was a little sad to see the place so deserted, as least the chicks that have left the island are hopefully beginning what could be a long life roaming the oceans and returning to the same colony in a few years to breed. In around three months time the adults will be back for another few busy months of chick rearing. 

Wanderer chick practicing flapping.
The only type of albatross now left on the island is the Wandering Albatrosses. The chicks are growing rapidly in size and some look almost bigger than their parents. The chicks will end up weighing more than their parents, and will lose their baby fat just before they fledge, so they can actually get off the ground! I often see the parents returning to feed the chick hearty meals of fish and squid. They get fed on average once a week, with the two parents flying potentially thousands of miles between feedings. 

Once a month everyone on base goes out and checks on all of the chicks across the island to check for failures. The last couple of months have had very few failures, this is because the chicks are now so large that the other predators (Giant Petrels/Skuas) are too small to be able to take them on (unless they are injured or sick). The main reason for failure is if one of the parents is killed by a long line fishing boat, and the other cannot usually manage to provide enough food and the chick starves. We have one chick that this has happened to named “Tiny Tim”. Since April Tim has been much smaller than the other chicks surrounding him. I’ve been expecting to find him dead every time I visit, but somehow he keeps surviving. It’s now mid July and he is still alive and has gotten a little bigger, but is very under weight for his age. It has been known for small chicks to fledge, so I’ve got my fingers crossed that Tim is going to be one of the lucky ones, and his one remaining parent keeps doing such a good job. I’ll keep you updated with how he does. 

One of the other more notable Wanderer chicks is Scruffy chick. Whilst I was doing this month’s checks on the chicks I realised that one was missing. I found the empty nest and presumed the chick had died and been dragged off as a tasty snack for a Giant Petrel. I began searching though the tussac grass to find the body when I suddenly spotted the head, which moved! As I approached I realised that the chick seemed to be below ground level, it looked very strange. When I got to the chick all I could see was its head and a little bit of its back down a deep hole in the ground. The chick was still alive but was pretty weak, it barely had the energy to try and defend itself from me.  I dug out some of the soil that had fallen onto the chick and eventually managed to get my arm underneath the chick’s breast to try and pull it out. The chick was well and truly wedged down the hole, which was full of sticky mud and it was not giving the chick up easily. After about 15 minutes I managed to heave the chick out and lay flat on my back holding the chick, both of us exhausted from the exertion. The poor chick was soaked to the skin in mud, and seemed to have a leg injury. I don’t know how long the chick had been down the hole, but it must have been quite some time, and through its struggling it had twisted its leg in a funny angle. I wasn’t sure if the leg was broken but it didn’t look good. I put the chick back on its nest where it lay flat exhausted. It was a pretty distressing experience for both of us, but at least he wasn’t going to die half buried under ground. As soon as I left the chick I saw a Giant Petrel land next to the nest. It’s amazing how quickly they can spot weakness. 

Scruffy Wanderer chick a few days after rescue.
A few days later I went back to check on the chick with Hannah. I was fully expecting to find him dead, but miraculously the chick was still alive and trying to hide underneath some tussac. Wanderer chicks generally feel safest while sitting on the nest mound, as they can see all around them, and it was the place that they were born. This chick clearly was very scared and was trying to hide under the grass. Hannah and I made some improvements to his nest, by adding pieces of grass to the nest cup and then placed him back on top. He immediately perked up and started busily rearranging his pieces of grass so they were comfy. The injured leg looked a lot better, and he was able to sit up and put weight on it. It still doesn’t look perfect but I have a lot more hope for his future. He was waggling his tail feathers and making contented noises to himself. I’ll keep going back every week to check on him and you never know he might recover. 

Adult Wandering Albatross back to feed its chick.

On the penguin front there are only Gentoo penguins around now. Not in as big numbers as in the summer months but there are often a couple of them on the beach in front of base, and bigger numbers on the breeding beaches. Unfortunately for the penguins the Leopard seals have taken a liking to the taste of them and we’ve found a couple injured on the beach. I’ve been working on my penguin calls but I’m not very good. Sometimes I can get a response, I’ll keep working on it. 

It’s not only penguins that are becoming seal snacks, in the last week we’ve found two dead Giant Petrels that have been munched. This isn’t unknown but we definitely see less of it, there isn’t a massive amount of meat and you would have thought they’d have more chance of escape being able to fly. 

In Skua news there is now only one Skua on the island- Scratchy our adopted pet Skua. All of the rest has left for South Georgia and more food, but with his broken wing Scratchy has to remain here with us. He spends his days hanging around the kitchen door, taking copious baths in the stream (we think he has OCD) and sleeping. The rest of the Skuas probably won’t be back until September ready for the seal pups being born and a ready food supply on hand. Mmm placenta! 

Scratchy ice skating.