Lately I was reminded of this old episode that conveys in a gentle, subtle, humorous way how this debate about whether it's a turtle or a tortoise is somewhat futile since different countries do it differently, and the various other, supposedly more scientific terms are based on the same meanings, too, so any name you could be using for refering to the whole range of those animals that share the same traits are also based on the common terms for supposedly specific types. Sounds confusing? Exactly.

Wikipedia: https://en.wikipedia.org/wiki/Turtle#Turtle,_tortoise,_or_terrapin

P.S.:  The weird fact that in the thumbnail scene Tank's head came out of his butt was too tempting to pass up for an edit.