Bernard Castelein / Smooth-billed ani (Crotophaga ani) group of three with Rurenabaque, Bolivia

David Perpinan / Group of Guira cuckoos (Guira guira) in a tree, Pantanal, Mato Grosso do Sul, Brazil.

Hermann Brehm / Guira Cuckoo (Guira guira) group perched in trees, Pantanal, Brazil.

Bernard Castelein / Guira cuckoo (Guira guira) group of four, between Samaipata and St Cruz, Bolivia

Bernard Castelein / Guira cuckoo (Guira guira) group of four, between Samaipata and St Cruz, Bolivia

Enrique Lopez-Tapia / Nuns praying at ceremony in Ani Sangkhung Nunnery, in old centre of Lhasa. Lhasa, Tibet, China.

Karine Aigner / A group of Smooth billed ani (Crotophaga ani) at sunrise. Yasuni National Park, Ecuador. Amazon Rainforest.