Vishal Jadhav / Tickell's blue flycatcher (Cyornis tickelliae) male perched, then flies off, Maharashtra, India, March.

Vishal Jadhav / Tickell's blue flycatcher (Cyornis tickelliae) male perched, then flies off, Maharashtra, India, March.

Vishal Jadhav / Spotted dove (Spilopelia chinensis) walking on forest floor to drink water from a jungle stream, Maharashtra, India, March.

Vishal Jadhav / Spotted dove (Spilopelia chinensis) drinking water from a jungle stream with bees flying around, Maharashtra, India, March.

Vishal Jadhav / Red-vented bulbul (Pycnonotus cafer) drinking water from a puddle, Maharashtra, India, March.

Vishal Jadhav / Chestnut-shouldered/ Yellow-throated sparrow (Gymnoris xanthocollis) drinking water from a stream, Maharashtra, India, March.

Vishal Jadhav / Black-rumped flameback / Lesser golden-backed woodpecker (Dinopium benghalense) male peering out of nest hole, then returns inside, Maharashtra, India, March.

Vishal Jadhav / Black-rumped flameback / Lesser golden-backed woodpecker (Dinopium benghalense) female peeping into tree nest hole, Maharashtra, India, March.

Vishal Jadhav / Black-rumped flameback / Lesser golden-backed woodpecker (Dinopium benghalense) female inspecting nest hole from outside, looks around, then flies off, Maharashtra, India, March.

Vishal Jadhav / Black-rumped flameback woodpecker / Lesser golden-backed woodpecker (Dinopium benghalense) female peering out of nest hole in tree, then flies off, Maharashtra, India, March.

Vishal Jadhav / Indian paradise flycatcher (Terpsiphone paradisi) adult male diving down, then returning to land on perch, shaking off water, Maharashtra, India, March.

Vishal Jadhav / Indian paradise flycatcher (Terpsiphone paradisi) adult male perching, cleaning beak and shaking its feathers, Maharashtra, India, March.

Vishal Jadhav / Indian paradise flycatcher (Terpsiphone paradisi) juvenile male diving down, then returning to land on perch, shaking off water, Maharashtra, India, March.

Lewis Jefferies / Scarlet macaw (Ara macao) feeding on wild walnuts in the canopy, Carara National Park, Costa Rica, February.

Lewis Jefferies / Scarlet macaw (Ara macao) preening in the canopy, Carara National Park, Costa Rica, February.

Lewis Jefferies / Black-hooded antshrike (Thamnophilus bridgesi) male vocalising, Merino Bellena National Park, Costa rica, February.

Bernard Castelein / Four Gadwall (Anas strepera) in flight, Zeeland, The Netherlands. September.

Bernard Castelein / Two Red-eyed dove (Streptopelia semitorquata) perched on a branch, Allahein river, The Gambia.

Bernard Castelein / Red-eyed dove (Streptopelia semitorquata) drinking at waters edge, Allahein river, The Gambia.

Bernard Castelein / Red-eyed dove (Streptopelia semitorquata) at waters edge, Allahein river, The Gambia.

Bernard Castelein / Red-eyed dove (Streptopelia semitorquata) drinking at waters edge, Allahein river, The Gambia.

Bernard Castelein / Red-eyed dove (Streptopelia semitorquata) at waters edge, Allahein river, The Gambia.

Bernard Castelein / Male Village weaver (Ploceus cucullatus) perched in tree, Allahein river, The Gambia.

Bernard Castelein / Lizard buzzard (Kaupifalco monogrammicus) perched in treetop, Allahein river, The Gambia.

Bernard Castelein / Gabar goshawk (Micronisus gabar) juvenile, plundering nest of Weaverbird, Allahein river, The Gambia.

Bernard Castelein / Palm-nut vulture (Gypohierax angolensis) in flight, Allahein river, The Gambia.

Bernard Castelein / Palm-nut vulture (Gypohierax angolensis) on riverbank, Allahein river, The Gambia.

Bernard Castelein / Palm-nut vulture (Gypohierax angolensis) on riverbank, Allahein river, The Gambia.

Bernard Castelein / African fish eagle (Haliaeetus vocifer), juvenile, in flight, Allahein river, The Gambia.

Bernard Castelein / African fish eagle (Haliaeetus vocifer), juvenile, perched in tree, Allahein river, The Gambia.

Bernard Castelein / African fish eagle (Haliaeetus vocifer), juvenile, taking flight, Allahein river, The Gambia

Bernard Castelein / Red-eyed dove (Streptopelia semitorquata) perched in treetop, Allahein river, The Gambia.

Bernard Castelein / Two male Village weaver (Ploceus cucullatus) perched in tree, squabbling, Allahein river, The Gambia.

Bernard Castelein / African fish eagle (Haliaeetus vocifer), juvenile, perched in treetop, sunbathing, Allahein river, The Gambia.

Bernard Castelein / African fish eagle (Haliaeetus vocifer), juvenile, in flight, Allahein river, The Gambia.

Bernard Castelein / African fish eagle (Haliaeetus vocifer), juvenile, flying low over river holding a freshly caught fish, Allahein river, The Gambia.

Bernard Castelein / Greyish eagle owl (Bubo cinerascens) perched in tree, Faraba Banta, The Gambia.

Bernard Castelein / Pearl-spotted owlet (Glaucidium perlatum) perched in tree, Allahein river, The Gambia.

Bernard Castelein / Pearl-spotted owlet (Glaucidium perlatum) perched in tree, Allahein river, The Gambia.

Bernard Castelein / Long-tailed nightjar (Caprimulgus climacurus) resting on forest floor, Brufut forest, The Gambia.

Bernard Castelein / Female Abyssinian ground hornbill (Bucorvus Abyssinicus) walking along riverbank, Allahein River, The Gambia.

Bernard Castelein / Western red-billed hornbill (Tockus kempi) perched in tree, Allahien River, The Gambia.

Bernard Castelein / Little bee-eater (Merops pusillus) with Widow dragonfly (Palpopleura portia) prey in beak, Allahein river, The Gambia.

Bernard Castelein / Male Giant kingfisher (Megaceryle maxima) perched on branch, Allahein river, The Gambia.

Bernard Castelein / Male Giant kingfisher (Megaceryle maxima) taking flight from tree branch, Allahein river, The Gambia.

Bernard Castelein / Female Giant kingfisher (Megaceryle maxima) perched on a branch, Allahein river, The Gambia.

Bernard Castelein / Male Giant kingfisher (Megaceryle maxima) perched on branch with a fish in its beak, Allahein river, The Gambia.

Bernard Castelein / Male Giant kingfisher (Megaceryle maxima) with ruffled feathers, perched on branch, Allahein river, The Gambia.

Bernard Castelein / Male Giant kingfisher (Megaceryle maxima) with ruffled feathers, perched on branch, Allahein river, The Gambia.

Bernard Castelein / Malachite kingfisher (Alcedo cristata), perched on branch holding a fish in its beak, Allahein river, The Gambia

Bernard Castelein / Malachite kingfisher (Alcedo cristata), perched on a branch, Allahein river, The Gambia.

Bernard Castelein / Pied kingfisher (Ceryle rudis) perched on branch, Allahein river, The Gambia.

Bernard Castelein / Pied kingfisher (Ceryle rudis) perched on branch, holding a freshly caught fish in its beak, Allahein river, The Gambia.

Bernard Castelein / Pied kingfisher (Ceryle rudis) taking flight, Allahein river, The Gambia.

Bernard Castelein / Pied kingfisher (Ceryle rudis) perched on branch, holding a freshly caught fish in its beak, Allahein river, The Gambia.

Bernard Castelein / Whimbrel (Numenius phaeopus), unusually perched in a dead tree, during high tide, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / Double-spurred francolin (Francolinus bicalcaratus) walking across mud, Allahein River, The Gambia.

Bernard Castelein / Spur-winged lapwing (Vanellus spinosus) displaying menacing behaviour, Allahein river, The Gambia.

Bernard Castelein / African wattled lapwing (Vanellus senegallus), bathing in river, Allahein river, The Gambia.

Bernard Castelein / African wattled lapwing (Vanellus senegallus), bathing in river, Allahein river, The Gambia.

Bernard Castelein / African wattled lapwing (Vanellus senegallus) wading in river, Allahein river, The Gambia.

Bernard Castelein / African wattled lapwing (Vanellus senegallus) scratching its neck, Allahein river, The Gambia.

Bernard Castelein / Marsh sandpiper (Tringa stagnatilis) wading through shallow water, Allahein river, The Gambia.

Bernard Castelein / Common greenshank (Tringa nebularia) resting on mud, Allahein river, The Gambia.

Bernard Castelein / Senegal thick-knee (Burhinus senegalensis), stretching wings after bathing, Allahein river, The Gambia.

Bernard Castelein / Two Senegal thick-knee (Burhinus senegalensis) calling, Allahein river, The Gambia.

Bernard Castelein / Two Senegal thick-knee (Burhinus senegalensis) standing on mud, Allahein river, The Gambia.

Bernard Castelein / Senegal thick-knee ( Burhinus senegalensis) bathing in river, Allahein river, The Gambia.

Bernard Castelein / Senegal thick-knee (Burhinus senegalensis) walking through shallow water, Allahein river, The Gambia.

Bernard Castelein / White-faced whistling duck (Actophilornis africanus) standing in shallow water, Allahein River, The Gambia.

Bernard Castelein / White-faced whistling duck (Actophilornis africanus) standing in shallow water, Allahein River, The Gambia.

Bernard Castelein / White-breasted cormorant (Phalacrocorax lucidus) in flight, with nesting material in beak, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / White-breasted cormorant (Phalacrocorax lucidus) taking flight from river, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / White-breasted cormorant (Phalacrocorax lucidus) in flight, carrying feather in beak, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / White-breasted cormorant (Phalacrocorax lucidus) flock, perched in treetop, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / White-breasted cormorant (Phalacrocorax lucidus) flock, perched in treetop, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / Pink-backed pelican (Pelecanus rufescens) juvenile, shaking its feathers after bathing, Allahein river, The Gambia.

Bernard Castelein / African darter (Anhinga rufa) swimming in river, partially submerged, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / African darter (Anhinga rufa) perched in mangrove, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / African darter (Anhinga rufa) walking down muddy riverbank towards river, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / African darter (Anhinga rufa) swimming in river, Bao Bolong Wetland Reserve, The Gambia.

Bernard Castelein / Hamerkop (Scopus umbretta) wading through algae covered water, Allahein river, The Gambia.

Bernard Castelein / Hamerkop (Scopus umbretta) swallowing a large frog, Allahein river, The Gambia.

Bernard Castelein / Hamerkop (Scopus umbretta), swallowing a large frog, Allahein river, The Gambia.

Bernard Castelein / Hamerkop (Scopus umbretta), swallowing a large frog, Allahein river, The Gambia.

Bernard Castelein / Hamerkop (Scopus umbretta), swallowing a large frog, Allahein river, The Gambia.

Bernard Castelein / Hamerkop (Scopus umbretta) holding a large frog in its beak, Allahein river, The Gambia.

Bernard Castelein / Great egret (Egretta alba) fishing in shallow water, Allahein River, The Gambia.

Bernard Castelein / Great egret (Egretta alba) fishing in shallow water, Allahein River, The Gambia.

Bernard Castelein / Great egret (Egretta alba) walking across mud in early morning sunlight, Allahein River, The Gambia.

Bernard Castelein / Western reef egret (Egretta gularis) running through shallow water with wings spread, chasing small fish, Kotu creek, The Gambia.

Bernard Castelein / Western reef egret (Egretta gularis) running through shallow water with wings open, chasing small fish, Kotu creek, The Gambia.

Bernard Castelein / Western reef egret (Egretta gularis) running through shallow water with wings open, chasing small fish, Kotu creek, The Gambia.

Bernard Castelein / Western reef egret (Egretta gularis) running through shallow water with wings open, chasing small fish, Kotu creek, The Gambia.

Bernard Castelein / Western reef egret (Egretta gularis) running through shallow water with wings open, chasing small fish, Kotu creek, The Gambia.

Bernard Castelein / Western reef egret (Egretta gularis) running through shallow water with wings open, chasing small fish, Kotu creek, The Gambia.