Eels are fish

Apparently we are all fish. Or fish don't exist.

To explain: if you want to define a taxonomy in which all things that look like fish and swim are 'fish' then we are too. We are more closely related to most 'fish' than sharks are. I.e the last common ancestor of herring AND sharks is older than our & herring's LCA.

There's a certain species of ape that takes offense at this, and doesn't like to think of itself as a "fish".