A disgusting statement bred of ignorance; good only to label based on labels. Behold, the birth of human superiority: future of the skinheads, radicals, and violently stupid. Rejoice; your legacy is assured.
in normal people context an animal is anything that isn't human.
besides, do animals of one species usually mate with other animals that are of a different species? No.
animals not mating with others of different species naturally is akin to what is referred to as "beastiality" or "zoophilia" in our context, otherwise a human mating with an animal of a different species.
are you trying to make me flame you?