1
Common bottlenose dolphin
Tursiops truncatus truncatus
LC
Red Sea, Egypt
Self-medicating on bush-like corals called gorgonians
1
Indo-Pacific bottlenose dolphin
Tursiops aduncus
NT
Wild Coast, Eastern Cape, South Africa
2
Orange-dotted tuskfish
Choerodon anchorago
LC
Lizard Island, Australia
2
White strawberry cockle
Fragum fragum
NE
Lizard Island, Australia
Both species of Cardiidae cockles found on Lizard Island [1] make an appearance, but the Pacific strawberry cockle (Fragum unedo), with its distinctive red sculpturing on its radial ribs [2] is shown very briefly (e.g. at 10:25). The white strawberry cockle (Fragum fragum) is shown more consistently throughout the sequence.
[Link 1] [Link 2]
[Link 1] [Link 2]
3
Indopacific sooty tern
Onychoprion fuscatus nubilosus
LC
Goelettes Island, Farquhar Atoll, Seychelles
There are also two brief shots of a trevally launching out of the water where we see it hunting a brown noddy (Anous stolidus) at 15:13 and 15:34.
3
Giant trevally
Caranx ignobilis
LC
Goelettes Island, Farquhar Atoll, Seychelles
https://wildbirdconservation.wordpress.com/2017/11/04/a-bbc-natural-history-unit-first-for-sooty-terns/
4
Munk's devil ray
Mobula munkiana
VU
Sea of Cortés, Baja California, Mexico
5
False killer whale
Pseudorca crassidens
NT
Hauraki Gulf, North Island, New Zealand
5
Common bottlenose dolphin
Tursiops truncatus truncatus
LC
Hauraki Gulf, North Island, New Zealand
6
Northern sea otter
Enhydra lutris kenyoni
EN
Alaska, USA
In Alaska, sea otters lounge together in great rafts on the water's surface above the kelp forests of the Pacific Coast.
This brief shot of this species precedes a more in-depth in the "Green Seas" episode [1], which showcases the otters' pivotal role in controlling the population of sea urchins which feed on the kelp forests.
[Link 1]
[Link 1]
6
Red sea urchin
Mesocentrotus franciscanus
NE
Alaska, USA
Montage - Species featured in more depth in a future episode
6
Orange-footed sea cucumber
Cucumaria frondosa
NE
Bergen, Norway
Orange-footed sea cucumbers emerge in the waters off Bergen, Norway, to feed using each of their ten arms to grab starfish eggs floating in the water.
This brief shot of this species precedes a more in-depth in the "Green Seas" episode [1].
[Link 1]
[Link 1]
6
Common seadragon
Phyllopteryx taeniolatus
LC
Flinders Pier, Flinders, Victoria, Australia
Common seadragons are perfectly camouflaged amid in the green seas off Victoria, Australia.
This brief shot of this species precedes a more in-depth in the "Green Seas" episode. Details on the filming location can be found on that episode's page [1].
[Link 1]
[Link 1]
7
Asian sheepshead wrasse
Semicossyphus reticulatus
DD
8
Atlantic herring
Clupea harengus
LC
Vengsøy & Andfjord, Norway
8
Killer whale
Orcinus orca
DD
Vengsøy & Andfjord, Norway
Stunning shoals of Atlantic herring with a beat of their tails (a method known as 'carousel' feeding)
8
Humpback whale
Megaptera novaeangliae
LC
Andfjord, Norway
9
Atlantic walrus
Odobenus rosmarus rosmarus
NT
Kvitøya, Svalbard, Norway
The shots of the walrus trying to haul out on glacial ice, given the lack of sea ice, were filmed off Kvitøya in Svalbard, according to a behind-the-scenes article [1].
[Link 1]
[Link 1]
9
Polar bear
Ursus maritimus
VU
Kvitøya, Svalbard, Norway
More details about the polar bear encounter for this sequence can be found in this article from WIRED [1]: "The team behind the BBC's Blue Planet II was filming a colony of walruses in the Arctic one afternoon when a polar bear appeared in the distance. "As it got closer we were able to view it through the telescopic lens of their Cineflex camera system," says BBC producer and photographer Jonathan Smith . "We assumed that it was looking for one of the many pups in the colony." As the bear closed in, the walruses got spooked. As one ran, a chain reaction began and the entire colony rushed into the sea."
[Link 1]
[Link 1]