Sandesh Kadur / Slow motion clip of Amur falcons (Falco amurensis) congregating at roost site during their migration from Siberia to Africa, near Doyang reservoir, Nagaland, India, October.

Juergen Freund / Colony of Little red flying foxes (Pteropus scapulatus) leaving roost site, Atherton Tablelands, Queensland, Australia.

SCOTLAND: The Big Picture / Panning shot of a large flock of Pink-footed geese (Anser brachyrhynchus) taking off from their roosting site, Montrose, Angus, Scotland, UK, November.

Nick Upton / Flock of Jackdaws (Corvus mondedula) taking off from their roost site, Gloucestershire, England, UK, December.

Claudio Contreras / Caribbean flamingo (Phoenicopterus ruber) about to take off to roosting site, Ria Celestun Biosphere Reserve, Yucatan Peninsula Mexico, January. Best image taken in Mexico and specially commended in...

Andrew Parkinson / Gannet (Morus bassanus) adult taking off from temporary roost sight. Shetland Islands, Scotland, UK, September.

Andrew Parkinson / Gannet (Morus bassanus) sub-adults roosting on a coastal rock Shetland Islands, Scotland, UK, July

Konrad Wothe / Flock of Snow Geese (Chen caerulescens atlanticus / Chen caerulescens) in flight to their winter roosting site, crossing a full moon, Bosque del Apache, New Mexico, USA, November

Mary McDonald / Flock of Cattle Egrets (Bubulcus ibis) in roosting trees at dusk, Imba Ndutu, Serengeti NP, Tanzania, East Africa.

Andy Rouse / Knot (Calidris canutus islandica) in water at winter roost site, Lancashire, UK

Doug Gimesy / Grey-headed flying-foxes (Pteropus poliocephalus) fly around their roosting site. Yarra Bend Park, Kew, Victoria, Australia. February, 2017

Heather Angel / Long-horned bee (Eucera sp.), two crawling into Wild gladiolus (Gladiolus atroviolaceus) flower to roost at night. Turkey. May.