Christmas imperial pigeon

The Christmas imperial pigeon, Black imperial pigeon, Dusky imperial pigeon, Wharton's imperial pigeon, or burong pergam (Ducula whartoni), is a large imperial pigeon endemic to Christmas Island in the northeastern Indian Ocean. It has an overall grey-blue colouration, and juveniles are duller than adults. It makes a soft purring coo sound and a deeper whoo sound comparable to a cow mooing. It lays one glossy white egg per brood, and is possibly somewhat colonial.

Christmas imperial pigeon

The Christmas imperial pigeon, Black imperial pigeon, Dusky imperial pigeon, Wharton's imperial pigeon, or burong pergam (Ducula whartoni), is a large imperial pigeon endemic to Christmas Island in the northeastern Indian Ocean. It has an overall grey-blue colouration, and juveniles are duller than adults. It makes a soft purring coo sound and a deeper whoo sound comparable to a cow mooing. It lays one glossy white egg per brood, and is possibly somewhat colonial.