Interspecies: Sexual, mating, or romantic activity between different species. They should always be from different family sub-classes (e.g., feline/canine, equine/cetacean, but not lion/tiger). A good rule of thumb is if they can realistically breed offspring this should NOT be used.

• Pokemon may also get this tag, but they must be of both separate species and evolutionary line. For example, a charmander and a bulbasaur would be valid for interspecies, but a charmander and a charizard would not be.

The opposite of interspecies is intraspecies.