Most land animals are crustaceans (insects, spiders etc.), actually. Unless you define crustaceans as fish, too, which stretches the word ‘fish’ even more than including all land animals but isn’t completely without logic, either. ‘fish’ is a really imprecise category.
Whales are fish
Bell curve meme
So are most land animals when you think about it.
Most land animals are crustaceans (insects, spiders etc.), actually. Unless you define crustaceans as fish, too, which stretches the word ‘fish’ even more than including all land animals but isn’t completely without logic, either. ‘fish’ is a really imprecise category.