Broke: Whales are fish because they look like other fish Woke: Whales aren’t fish because they’re in the class Mammalia, not Pisces Bespoke: Whales are fish any monophyletic group that encompasses all the fishes must also include the clade Tetrapoda Artichoke: Whales aren’t fish because fishes are a paraphyletic group that includes the entire clade Vertebrata at the exclusion of the clade Tetrapoda. Stick and Poke: Whales are fish because they’ve developed the same bodyplan and are in the same ecological niche as the pelagic fishes.