Five Films / Black jacobin humingbird (Florisuga fusca) feeding from a nectar feeder, Reserva Ecologica de Guapiacu, Rio de Janeiro, Brazil, 2015.

Five Films / Black jacobin hummingbird (Florisuga fusca) hovering and feeding from a nectar feeder, Reserva Ecologica de Guapiacu, Rio de Janeiro, Brazil, 2015.

Hanne & Jens Eriksen / Jacobin cuckoo (Clamator jacobinus) on twig, India, February.

Hermann Brehm / Jacobin Cuckoo (Clamator jacobinus) fledgling begging for food from Arrow-marked Babbler (Turdoides jardineii ) Kwara, Botswana June

Hermann Brehm / Jacobin Cuckoo (Clamator jacobinus) fledgling begging for food from Arrow-marked Babbler (Turdoides jardineii ) Kwara, Botswana June

Hermann Brehm / Jacobin Cuckoo (Clamator jacobinus) fledgling begging for food from Arrow-marked Babbler (Turdoides jardineii ) Kwara, Botswana June

Paul D Stewart / Three illustrations from Cassell's Pigeon Book, 1874 showing domestic pigeons: Red and Yellow Jacobin, Red-pied pouter cock with crop inflated, and Shield, Hyacinth and Suabian.

Luiz Claudio Marigo / Black jacobin (Florisuga fusca) Atlantic Rainforest, Serra Bonita Private Natural Heritage Reserve (RPPN Serra Bonita), Camacan, Southern Bahia State, Eastern Brazil.

Luiz Claudio Marigo / Black jacobin (Florisuga fusca) Atlantic Rainforest, Serra Bonita Private Natural Heritage Reserve (RPPN Serra Bonita), Camacan, Southern Bahia State, Eastern Brazil.

Luiz Claudio Marigo / Black jacobin (Florisuga fusca) Atlantic Rainforest, Serra Bonita Private Natural Heritage Reserve (RPPN Serra Bonita), Camacan, Southern Bahia State, Eastern Brazil.

Hanne & Jens Eriksen / Pied cuckoo (Oxylophus jacobinus) adult with food, Oman, November

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