Avian Anatomy

2. The back of a bird's neck.
4. The central shaft of a feather.
6. A specialized stomach that grinds food, often with the aid of ingested stones.
7. The fleshy area at the base of the upper beak, often containing the nostrils.
9. A tuft of feathers on the head of some birds.
10. The parallel filaments that branch off from the central shaft of a feather.
13. One of the two parts of a bird's beak (upper or lower jaw).
15. The part of a bird's leg between the knee and the toes.

1. Feathers at the rear of a bird's body used for steering during flight.
3. The collective term for a bird's feathers.
5. Sharp claws on the feet of birds of prey.
8. Structures that cover a bird's body, providing insulation and enabling flight.
11. The area of a bird's back just above the tail.
12. Limbs modified for flight.
14. Hard, pointed mouthpart used for eating and grooming.