well humans are 1 kind
we are greatly varied though...as family groups became isolated by location, they developed their own special features. Hence why there are many nations with very distinguishable features. You can genrally look at someone and know which part of the earth they are from or what nation they are from.
yet all humans can interbreed because they are the same 'kind'
IOW there is only one 'kind' of the human species.
So....is a "dog" a kind? Do you classify a grey wolf as a dog? Can a grey wolf breed with a chihuahua?
What a bout sea turtles and box turtles? Both of the "turtle kind", yes? Can they breed?
What kind is a platypus?
What kind is a chimp? A silver back gorilla? can they breed?
What kind is a giraffe?
Seems like a pretty broad definition of "kind" if you ask me.