How about a marine DLC, like over 113 sea creature species including:
Dolphins (8): Atlantic Bottlenose, Indo-Pacific Bottlenose, Atlantic White-Sided, Pacific White-Sided, Indo-Pacific Humpback, Atlantic Spotted, Australian Snubfin, Commerson's
Whales (4): Killer, False Killer, Short-Finned Pilot, Beluga
Sea Lions (6): California, Steller's, Australian, South American, New Zealand, Galapagos
Fur Seals (4): Northern, South African, Guadalupe, South American
Seals (10): Harbor, Harp, Leopard, Weddell, Gray, Spotted, Bearded, Hooded, Northern Elephant, Hawaiian Monk
Pacific Walruses
Southern Sea Otters
West Indian Manatees
Dugongs
Penguins (10): Emperor, King, Adelie, Chinstrap, Gentoo, Little Blue, Humboldt, South African, Northern Rockhopper, Macaroni
Puffins (2): Atlantic, Horned
Common Murres
Brown Pelicans
Sea Turtles (5): Green, Loggerhead, Leatherback, Hawksbill, Olive Ridley
Galapagos Marine Iguanas
Sharks (12): Sand Tiger, Sandbar, Blacktip Reef, Zebra, Nurse, Leopard, Bonnethead, Brown-Banded Bamboo, Whale, Great Hammerhead, Great White, Tiger
Rays (4): Giant Manta, Spotted Eagle, Porcupine, Bat
Stingrays (3): Southern, Cownose, Leopard
Spotted Wobbegongs
Smalltooth Sawfish
Groupers (2): Queensland, Atlantic Goliath
Great Barracudas
Humphead Wrasses
Hogfish
Ocean Sunfish
Mahi Mahis
Atlantic Bluefin Tuna
Atlantic Tarpons
Giant Trevallies
Porcupine Pufferfish
Red Lionfish
Bowmouth Guitarfish
Red Drums
Wolf Eels
Green Moray Eels
Sea Dragons (2): Weedy, Leafy
Jellyfish (4): Moon, Pacific Sea Nettle, Atlantic Sea Nettle, Lion's Mane
Octopuses (2): Giant Pacific, Common
Australian Giant Cuttlefish
Crabs (4): Japanese Giant Spider, Tasmanian Giant, Blue Land, Coconut
Lobsters (2): Maine, Caribbean Spiny
Starfish (3): Bat, Sunflower, Crown-of-Thorns
Giant California Sea Cucumbers
