Bird

Many - see section below.

Trivia

• To preen or groom their feathers, birds use their bills to brush away foreign particles.
• The birds of a region are called the avifauna.
• Few birds use chemical defences against predators. Tubenoses can eject an unpleasant slime against an aggressor, and some species of pitohui, found in New Guinea secrete a powerful neurotoxin in their feathers.
• Birds are among the most extensively studied animal groups, with hundreds of academic journals devoted to their study.