As pointed out by Stephen Jay Gould and the show QI - "There's no such thing as a fish". Likewise, there's no such thing as a tree. Try asking a person in the

As pointed out by Stephen Jay Gould and the show QI - "There's no such thing as a fish". Likewise, there's no such thing as a tree. Try asking a person in the street "Is X an animal" - where is bumblebee, fish, roach, dustmite, jellyfish. The default image of animal is a dry mammal or bird. As I understand it, the law has a section for birds, a section for mammals, and a section for fish. The section for fish might better be termed Animals that are not mammals or birds, but I guess that gets cumbersome.