Showing posts with label Snow Petrel. Show all posts
Showing posts with label Snow Petrel. Show all posts

Wednesday, 20 February 2019

2019 Update

It is amazing how quickly time flies by during the closing stages of a seabird season and the colonies have certainly changed to reflect it! As summer draws to a close most of the species are getting ready to fledge their chicks, but one species gets there that bit sooner than all the rest; Adelie Penguins.
A colony full of chicks getting close to fledging
The colonies were full of large chicks in January and towards the end of the month they were sporting some funky hairstyles as their chick down moulted away to make way for the first set of true feathers.
Some impressive chest hair to go with the thick beard there!
That has to be a wig, surely!?!
Once the chicks have fully moulted they look like real little penguins and start to venture out from the colony. They will follow adults around, begging for food, but will eventually have to leave the colonies to fend for themselves.
The chicks are quite different to the adults, although they are unmistakably still Adelies
When the chicks do finally start to leave then they go en masse, hundreds of chicks disappearing off for their first swim and to fend for themselves, all within the space of just a couple of weeks.
Out of the colony and off to the ocean
Luckily for us, although the Adelie colonies became empty from early February there were still plenty of other species around for us to see and study. The Chinstrap penguins are roughly one month later than the Adelies and so when the Adelie chicks were getting big and ready to leave the Chinstraps chicks were only just getting big enough to be left unguarded by adults.
The adults stay near the nest for a while, even when the chicks are too big to be brooded
But the chicks are soon left to themselves, in the safety of the colony, so both parents can go and collect food for them
Although, by late February the chinstraps are also getting very big and are on the verge of fledging themselves!
The Chinstrap chicks are quite varied in development but they are all getting there
Hairy-backed penguin!
Our third penguin species, the Gentoo, are closer to the Adelies in terms of timings but are still a fraction later. So, although many of the chicks haven't yet left the colonies, they are now roaming around and getting ready to go.
Gentoos almost ready to go
The early part of the year hasn't just been a great time of development for the penguins. The flying birds have also made a lot of progress. The Snow Petrels have developed from little bundles of fluff...
Even at this early stage the chicks are left alone, in the safety of well hidden nests
...to large chicks looking a little scraggly as their flight feathers come through.
So big it is almost too big for the gap between rocks!
It won't be long until these guys leave as well but when they do they'll have to leave the comfort of their nests, hidden away under rocks and in crevices.
Spot the chick peeking out!
The Blue-Eyed Shags are also on the verge of fledging. Although they are much more nervous at this stage so getting near them is something we avoid so as not to disturb them, however, it was only a month ago when they were still bundles of fluff being watched over by the adults themselves!
A shag colony is a very busy place
Especially when there are three big chicks in a lot of the nests
Not all species are currently or soon to be leaving though. The Southern Giant Petrels take a bit longer to fledge their chicks and they won't be ready to leave for the first time until April. For now the chicks are just starting to be left alone on the nest or with adults in close attendance.
A geep chick with adults nearby
The chicks may be all fluff but you can still see the white morph ones even at this stage as the fluff, like the feathers, is white rather than grey!
The white morph, or 'spirit chick', really does stand out compared to its grey neighbours
The seal activity increased through January but has since declined through February. Although they too will soon be leaving us for the season that doesn't mean they can't also show some excellent sights before they go.
A very sleepy blondie
A summer on Signy really does fly-by but it is all incredible when working with such amazing wildlife. And the scenery isn't too bad either!
A cloudy day can't detract from the spectacle that is Signy Island!

Thursday, 20 December 2018

Summertime!

The season is in full swing at Signy by the time we reach mid-summer and for the first time this season the sun has shown itself for nearly two full days!
With the sun shining on the huts at Gourlay the views are that much more spectacular
The Adelies were the first species to lay their eggs and as such they are at the most advanced breeding stage. The chicks are now pretty big and spill out from under the adults, although they are not yet quite big enough to be left unguarded.
One of many Adelie colonies on Signy
Spot all the fluffy chicks sticking out from under the adults!
The Adelies are great characters, the most boisterous and aggressive of the three penguin species here on Signy they can be heard calling almost continuously.
An Adelie calls and displays to its partner each time it returns to the nest
With the chicks getting that much bigger, and with the sun shining, the views we are getting of them are increasing rapidly. The peeping noises of the chicks can be heard almost as much as the calls of the adults and most of them can be seen standing up, stretching their flippers and begging for food!
Adelies lay two eggs and a number of nests are able to keep both chicks growing well
When the sun is out, the chicks are out so as to not get too hot, although some still prefer the comfort of the parents
Looking up at the sky, it's a bright new world for this chick!
Although the Adelies may be the most advanced they are by no means the only species very active at the moment. The Chinstraps are well in to incubation now and although there are a few stragglers just laying their eggs the majority will be starting to hatch in about a week's time.
Although most nests have eggs in them, that doesn't mean the nest can't be spruced up with a few new stones still!
The eggs are well incubated, even on sunny days as the air temperature and wind chill are still hovering around freezing!
It is not just the penguins that are active at this time of year. All our resident bird species are progressing with the breeding season. Our flying bird species - including: Snow Petrel, Wilson's Storm-Petrel. Antarctic Prion, Cape Petrel, Antarctic Tern, Brown Skua, Southern Giant Petrel and Snowy Sheathbill - are all now on nests with eggs to incubate. One of my favourites at the moment has to be the Snow Petrels, these strikingly beautiful birds can often be seen flying around, courting and displaying to each other.
Snow Petrel
Snow Petrels - along with Wilson's Storm-Petrels and Antarctic Prions - nest under rocks and in crevices so as to avoid the notice of predators. With Signy being such a rocky island there are so many places for them to breed that we are occasionally lucky enough to stumble across a nest site.
Often first found by the calls of the adults emanating from the rocks, Snow Petrels are now nesting for the season
All three species can be seen during the day, particularly the Snow Petrels, but they tend to be much more active at dusk and during the night when predators are less active and less likely to be able to see them coming ashore to the nest. However, there is one species that is active during the day that also nests under rock crevices; Snowy Sheathbills are more typically found near penguin colonies where there is a ready source of food available for this scavenging species.
Snowy Sheathbill
The predators that are being avoided by all these species are also busy making their own nests and incubating their own eggs. Brown Skuas are a regular sight across the island looking for anything they can predate so that they can be in full condition to raise their own chicks when the eggs hatch.
Brown Skua
Southern Giant Petrels can also predate and scavenge on the penguins and smaller petrels and prions. They are the largest flying species of bird on Signy and are still a particular favourite of mine from my time on Bird Island. Although the breeding colonies here on Signy are not visited as often as those on Bird Island we are still able to collect valuable data on the breeding success of this species each year.
A white morph Southern Giant Petrel - sometimes referred to as a 'spirit geep'
Although the birds are all busy during the summer breeding, the seals we have here are at a different stage of their life-cycle. Weddell, Elephant and Leopard Seals have all bred earlier in the year and pups have long-since been weined and gone their own ways. But that doesn't mean activity stops, in fact there are always seals about to see. Elephant Seals are a daily occurrence and they will continue to increase in numbers throughout the season. But Weddell and Leopard Seals are more infrequent sightings, particularly the Leps, and are most likely to be seen when there is ice in the bays.
Yep, this is a summer scene! Weddell Seals on ice in the bays around Signy
For the most part the seals are just ashore to sleep and relax whilst digesting their most recent meals.
A Weddell shows it's impressive teeth whilst having a yawn and a scratch!
Of the four species of seal we see on Signy (the fourth being Fur Seals - a fifth species, the Crabeater Seal, is a rarity but could also be seen if we are lucky!) the most infrequently seen is the Leopard Seal. Top predators these seals can grow up to 4 meters long and will eat penguins, skuas or anything they can get a hold of in the water or on the waters surface.
Leopard Seal
Leopard Seals are always an impressive sight, even if that is just whilst they are relaxing on the ice!
Two Leopard Seals on ice in the aptly named Hydrurga Cove (Hydrurga leptonyx is their scientific name)
With so many amazing species, and so much to see, an Antarctic summer is a very special time - even if the sun does only shine on the odd occasion!