| development of the skeleton and feathers of dusky parrots (pionus fuscus) in relation to their behaviour. | a clutch of five dusky parrots (pionus fuscus) was observed from hatching to fully grown. they were examined radiographically from 16 to 45 days of age, a few days before the cessation of bone growth, and the development of their feathers and their behaviour were also studied. it was observed that when growing birds were removed from the nest and placed singly on a flat surface they would stand up and walk about until restrained; normally these birds would move very little and lie in an intertwi ... | 2004 | 14758829 |