Black-crowned Night Heron
This is the standard Black-crowned Night Heron that is common worldwide.
Breeding plumage: Upperparts black with grey sides, dark grey tail, light
grey wings. Head black with two long narrow feathers floating backwards.
Non-breeding: No ornamental feathers on head.
Langrand, Olivier; 1990: Guide to the Birds of Madagascar, Yale University Press
Sinclair, I & Langrand, O.; 1998: Birds of the Indian Ocean Islands, Struik