Ferrets have been mated with mink, wild European polecats (ferrets) and ermine, and have been surrogates for black footed ferrets, and are related to otters, but I don't think that mating with an otter would be successful.
species
mammals
If it were possible - The new offspring would be classified under the male 'parent' animals bloodline.
a group of animals that can mate and producce fertile offspring.
Same specie
fertile
population
species by: Mario R
Uhm - what exactly to is unnatural mating?
species
They are different species. If they could mate to produce fertile offspring, they wouldn't have separate names.
Organisms of the same species can mate and produce offspring.