Described as a “revenge fantasy” where a group of Jewish American soldiers hunt down and kill Nazis; who were unapologetically racists, among other low forms of humanity. Twenty minutes after taking off from Mogadishu, Somalia at an altitude of 14,000ft an explosion occurred inside the aircraft. There were 74 passengers and 7 crew members on board.
So, the idea that any kind of sex is “unnatural” is kind of silly. Nature has no sexual morals. Wild animals in heat will attempt to mate with anything that even vaguely looks like a viable sexual partner. Point is, yes, animals that are of related species will mate all the time if they encounter each other in the wild, or in captivity. And some of those species are closely related enough that they can produce offspring (some fertile, others not).