Tell me whether these sea animals are fish or mammals: blue whale, beluga whale, manatee, dolphin, orca, humpback whale, whale shark, sea lion, walrus, seal, white tip shark, red tail shark, great white shark, guppy, danio, swordtail, tetra, cichlid, tuna, salmon, trout, puffer fish

The following are all mammals: blue whale, beluga whale, manatee, dolphin, orca, humpback whale, whale shark, sea lion, walrus, seal
The following are all fish: white tip shark, red tail shark, great white shark, guppy, danio, swordtail, tetra, cichlid, tuna, salmon, trout, puffer fish