Right! A crocodile adapts to live in salt water, but it is still a crocodile, it does not "speciate".
If animals, or rather the genes of families of animals did not change over time, there would be no drug resistant strains of disease. Do you deny that drug resistant strains of bacteria exist?
at this point, spurred by this statement, I must ask: Do you know what a species is? Do you know what factor is the basic divider between species?