I think that different animals from the same group should be breed-ed because it would create a brand new species. Like a tiger and a lion for instants it would be wonderful for them to get together because they are both big cats and they could cooperate well together. And their children, it is like a snowflake not one of them are the same. ( I might have gotten that wrong.) Or a dog and a wolf, both dog and they cooperate together like most of the dog breeds. Their children would be beautiful but it also would depend on the dog type (or cat). That is why you should take different animals from the same group and breed them.