Abstract
The suggestions offered by ethology, above all those about animal behavior, can help us to extract interesting elements for a ‘veterinarian bioethics’ and for a less mechanistic vision of animals and humans. What is an animal? This is the question of veterinary bioethics, a ‘metaethical’ question of ethological homologies which, as such, researches the underlying presuppositions according to the truth of specific natures. Veterinarian bioethics, in the consideration of the ‘nature’ of the animal genus and the respect due to it, making positive reference to the more nature contributions of ethology in the reestablishment of a value of ‘biodiversity’ as a criterion of balance in the qualities of life of the ecosystem.