Humpback Whales

This entry is part 3 of 5 in the series Antarctica

 

Humpbacks Whales feeding

Another blog from my latest amazing trip to Antarctica, focussing on Humpback whales this time. You’ll be glad to know that there is less blood than in the previous post.

Humpback in front of a glacier

Having lived for a year on South Georgia, immersed in the depressing history of Antarctic whaling and the impact of humans on Baleen whales, it was amazing to sail through Antarctic waters and see first-hand how the whales are bouncing back. Sightings of baleen whales were frequent with the most common being  humpbacks: these majestic 36 tonne beasts were almost ubiquitous throughout, it was an absolute pleasure.

Fin whale over the continental shelf
Minke whale in the Weddell Sea

Almost without fail, by the time breakfast was served on board National Geographic Explorer, there had been a blow, or a sighting of the distinctive hump, or flukes of these animals.

Fluke and dorsal hump!

Possibly the best experience of my time on board came as the sun was setting on an already eventful day of killer whales and penguins. Stupidly thinking the excitement was over for the day, I retreated to my room in order to download a few photos, when the call of ‘feeding Humpbacks’ came out over the tannoy.

This is what I emerged on deck to see

As a kid, I read about bubble net feeding whales and had seen footage of it numerous times on David Attenborough documentaries. For those others who have seen this footage, you will understand why seeing this activity has been on my bucket list for years. However, travelling to Antarctica, I had no expectations of ticking this off the list, since it was my understanding that such behaviour had only been observed in Alaska!

Bubble net feeding is obviously a foraging method where the humpbacks blow clouds of bubbles around their prey at the surface. This traps the prey between the bubbles and the surface allowing the whales to swim up with their mouths open and take huge mouthfuls of prey. 

The video bwlow shows one of these events happening and you can see the bubbles at the surface before the humpbacks lunge through open-mouthed

Humpback whales that spend summers in the Antarctic, exploiting the rich cold waters, migrate north to spend the winters in the tropics around Costa Rica. Here, there is an overlap with the Northern Humpbacks that spend their summers in Alaska and migrate south also to Central American tropics. The hypothesis is that these Northern whales, having learnt and practiced the behaviour in Alaska, migrated south to Central America before continuing through to Antarctica.

More feeding

As a result, you now have whales practicing bubble net feeding in Antarctic waters. The humpbacks have uniquely marked flukes which allow them to be identified.

Markings on the flukes

Hopefully, the individuals we photographed in Antarctica will have been observed previously in the world and we will get a better understanding of how this behaviour has spread.

There were small groups of feeding whales all around

And when you get bored of the whales (as if!) the sunset and the ice aren’t too bad substitutes!

Sunset

Feeding frenzy

This entry is part 34 of 47 in the series British Antarctic Survey
South Georgia seas brimming with pelagic birds
South Georgia seas brimming with pelagic birds

South Georgia hosts some of the most spectacular wildlife colonies in the world. People pay thousands of pounds and travel from all over the world to visit. Our most famous inhabitants are the penguins (4 species), seals (2 species) and albatross (4 species). There is an abundance of less ‘sexy’ wildlife utilising South Georgia for its breeding habitats and proximity to rich foraging grounds. Many of these species can be very elusive on the islands, breeding down burrows, visiting nesting sites in the dark and living predominantly over open ocean. This has meant sightings have been few and far between from base. I have spent the last two weeks on board a vessel in the southern ocean and this opportunity has allowed me time to see some of these scarcer pelagic species

Cape Petrel
Cape Petrel spots something
Cape Petrel
Cape Petrel – Target identified
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Diving initiated
Target acquired
Target acquired
Dive commenced
Back to the surface

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Heading off after a successful hunt
Heading off after a successful hunt

Probably the most common of these pelagic species around boats are the cape petrels (seen above), often spotted cruising in the slipstream of ships in the southern hemisphere. As a result, I have a number of the same shots of capes in flight. However, it was a great surprise to see one diving and fishing alongside our ship. The bird must have unearthed a small quantity of krill since it wasn’t long before other species were investigating – like this Antarctic Petrel.

Atlantic Petrel in flight
Antarctic Petrel in flight
Atlantic P
Antarctic Petrel coming into land
Atlantic Petrel takes a deep breath
Antarctic Petrel takes a deep breath
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Antarctic Petrel Diving
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Antarctic petrel still diving
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Antarctic petrel still diving
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Back up to the surface
Successfully on the sea, he gains his composure
After a successful pursuit it enjoys its meal

Finally it was the turn of the most elusive of them all, the Blue Petrel. I have spent hours on board ships trying to get pictures of these guys. Although common around boats, they tend to keep their distance. They also move incredibly quickly, meaning previous attempts have been limited to blurry distant unidentifiable specs. When this bird came in close to take advantage of the easy krill meal, I was thrilled. Unfortunately, the sun decided it was a good time to hide away but you can’t have everything!

Blue Petrel
Blue Petrel
Blue Petrel coming in for a meal
Blue Petrel coming in for a meal
Can you see it?
Can you see it?

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Heading back away from the boat
Off for more!