In mammalogy:

• White-headed Capuchin, small New World monkey of the family Cebidae
• White-headed Marmoset, marmoset endemic to Brazil

In ornithology:

• White-headed Duck, small stiff-tailed duck
• White-headed Flightless Steamer Duck, bird endemic to Argentina
• White-headed Marsh Tyrant, small passerine bird in the tyrant flycatcher family
• White-headed Pigeon, pigeon that is native to Australia
• White-headed Plover, medium-sized wader
• White-headed Woodpecker, non-migratory woodpecker that resides in pine forests of the mountains of western North America