Yeah, I think there’s a common alternative/unscientific taxonomy that probably varies from person to person and also by when you ask them that some people have that seems to go a bit like:
animals
__mammals
____humans
____apes
____whales
__marsupials
__reptiles
__birds
insects
__wasps
__ants
arachnids
__spiders
__scorpions
__ticks
fish
__sharks
__guppies
__trout
other acquatic categories
__crustaceans
__jellyfish
I imagine it has to do with identifying with warm-blooded land animals and not with others.
And there is something meaningful at that level of distinction, which could even be correct by scientific taxonomy but it would span two or three levels (family, phylum, class), but only the few up on their biology/zoology are liable to know the terms for that… i.e. they mean phylum Chordata, and sort of mammals, I guess? Correct animal classifications aren’t really easy to figure out.