You have seen it all with respect to inter-species harmony when you have seen this video of a tabby cat head butting and scent exchanging a dolphin! These two get along great. The water is no barrier almost.
Both the dolphin and cat want more interaction. The cat pulls the dolphin nearer! And the dolphin rubs his nose over the cat.
It is beautiful and astonishing to see.
Other videos where cats get along with other species of animal (excluding the human):