The problem is that there is NO scientific test to tell if animals DO belong to different "kinds". None.
The reason for that is simple. Kinds are unrelated by definition. The point of proposing "kinds" is to deny many relationships of common descent - so the proponents of "kinds" have to reject any evidence supporting those relationships, even though it is clearly relevant. But this leaves them with no test at all.
The whole idea is religious, not scientific.