Increasingly, science is producing hybrids, combinations of various animals. As mentioned in this MSNBC article such actions could have ethical implications.
Actually it is quite common for animals to band together to kill both their own species and other species. Many animals are territorial and will hunt and kill other members of their same species that enter or infringe on their territory. There are also examples of animals that will expand or move their territory driving out, killing or adopting the members of their species that are in the new territory.
Humans are just animals and so we often behave just like the other animals.
But the topic was meant to address the question of genetic engineering of humans as well as other species.