Beyond Cats and Dogs which are certainly each a Kind I don't have a definition of Kind. It is determined by the genetics and that is too hard to judge from the phenotype. So, I don't know if "Ape" is a Kind or "Chimp" is a Kind. But wherever the genetic diversity is depleted through the processes of (micro)evolution, that defines the boundary of the Kind. It's whatever "reproduces after its own kind" and never produces anything but that kind.
But jar is right, this off topic side issue has gone on too long already.
Edited by Faith, : No reason given.