Episode 9: The Galápagos, Darwin's Island
- American Flamingo (Phoenicopterus ruber)
- Blue-footed Booby (Sula nebouxii)
- Common Bottlenose Dolphin (Tursiops truncatus)
- Galápagos Penguin (Spheniscus mendiculus) (cameo)
- Galápagos Sea Lion (Zalophus wollebaeki)
- Galápagos Tortoise (Chelonoidis nigra)
- Green Sea Turtle (Chelonia mydas)
- Magnificent Frigatebird (Fregata magnificens)
- Marine Iguana (Amblyrhynchus cristatus)
- Sally Lightfoot Crab (Grapsus grapsus)
- Waved Albatross (Phoebastria irrorata) (cameo) Episode 10: Arctic Sea, A Frozen Voyage
- Arctic Fox (Vulpes lagopus)
- Arctic Tern (Sterna paradisaea)
- Bearded Seal (Erignathus barbatus)
- Common Murre (Uria aalge)
- Dall's Porpoise (Phocoenoides dalli)
- Glaucous Gull (Larus hyperboreus) (cameo)
- Humpback Whale (Megaptera novaeangliae)
- Ivory Gull (Pagophila eburnea)
- Killer Whale (Orcinus orca)
- Laysan Albatross (Phoebastria immutabilis) (mentioned)
- Little Auk (Alle alle) (cameo)
- Northern Fur Seal (Callorhinus ursinus) (mentioned)
- Pacific Walrus (Odobenus rosmarus divergens)
- Pacific White-sided Dolphin (Lagenorhynchus obliquidens) (cameo)
- Polar Bear (Ursus maritimus)
- Ribbon Seal (Histriophoca fasciata)
- Salmon Shark (Lamna ditropis)
- Sea Otter (Enhydra lutris)
- Spectacled Cormorant (Phalacrocorax perspicillatus)
- Sperm Whale (Physeter macrocephalus) (mentioned)
- Steller's Eider (Polysticta stelleri) (cameo)
- Steller's Sea Cow (Hydrodamalis gigas) (mentioned)
- Steller's Sea Eagle (Haliaeetus pelagicus)
- Steller's Sea Lion (Eumetopias jubatus)
- Tundra Wolf (Canis lupus albus)