Luiz Claudio Marigo / Black jacobin (Florisuga fusca) perched in Atlantic Rainforest, Serrinha do Alambari Environmental Protection Area, Rio de Janeiro State, Southeastern Brazil.

Luiz Claudio Marigo / Black jacobin (Florisuga fusca) perched in Atlantic Rainforest, Serrinha do Alambari Environmental Protection Area, Rio de Janeiro State, Southeastern Brazil.

Gabriel Rojo / Black jacobin {Melanotrochilus fuscus} Iguazu NP, Brazil / Argentina

Glenn Bartley/ BIA / Black Jacobin (Melanotrochilus fuscus) hummingbird feeding on flower nectar, Atlantic Rainforest, Brazil

Agustin Esmoris / Black Jacobin (Melanotrochilus fuscus) hummingbird feeding on flower nectar, Argentina

Vishal Jadhav / Jacobin cuckoo (Clamator jacobinus) calling whilst perched on branch and looking around, Pune, India.

Vishal Jadhav / Jacobin cuckoo (Clamator jacobinus) looking around before vocalising and jumping out of frame whilst flapping, Pune, India.

Ashish & Shanthi Chandola / Pied cuckoo (Clamator jacobinus), Ranthambhore NP, Rajasthan, India

Ashish & Shanthi Chandola / Pied cuckoo (Clamator jacobinus), Ranthambhore National Park, Rajasthan, India

Ashish & Shanthi Chandola / Pied cuckoo (Clamator jacobinus), Ranthambhore National Park, Rajasthan, India

Ann & Steve Toon / Jacobin cuckoo (Clamator jacobinus), Kruger national park, South Africa, November.