NGS Style Manual‎ > ‎- A -‎ > ‎

ANIMALS

Refer to an animal as it, unless sex is known; generally avoid using who with animals.

As a general rule, for breeds of animals capitalize any part of the name that derives from a proper noun:
            a Boston bull
            the Holstein cow
            a Black Angus
but
            arctic hare, etc.

Names given to pets or wild animals take initial caps and no quotes:
            Mary Crocodile
            Koko

Lowercase numbered groups or individuals:
            group 817        herd 111
            male 204          bull number 55

Animal sounds and bird calls are italic, no quotation marks; for plural add roman s to the italic word and apostrophe:
            the black-and-white male's dreo, dreo, dreo
           
mating call hoo's
            high-pitched whoo-ing call

See also BREEDS, NAMES (section 4), SCIENTIFIC NOMENCLATURE.