Neil Challis / Long-tailed macaque (Macaca fascicularis) playing on mangrove roots, Southern Thailand, March.

Neil Challis / Long-tailed macaque (Macaca fascicularis) female suckling and grooming infants on a branch, Central Thailand, December.

Neil Challis / Long-tailed macaque (Macaca fascicularis) hanging upside down on vines before falling off, Central Thailand, November.

Neil Challis / Long-tailed macaque (Macaca fascicularis) female cuddling infant in rain, Central Thailand, November.

Neil Challis / Long-tailed macaque (Macaca fascicularis) swimming across creek, running up mud bank, Southern Thailand, January.

Neil Challis / Infant Long-tailed macaque (Macaca fascicularis) suckling and cuddling with mother, before being snatched by another adult, Central Thailand, September.

Neil Challis / Female Stump-tailed macaque (Macaca arctoides) grooming infant on table, Central Thailand, September.

Neil Challis / Crimson-tailed marsh skimmer dragonfly (Orthetrum pruinosum) eating a bee on perch, Central Thailand, September.

Neil Challis / Male Baya weaver (Ploceus philippinus) working on hanging nest, Central Thailand, August.

Neil Challis / Long-tailed macaque (Macaca fascicularis) male and small puppy facing up to each other, Central Thailand, July.

Neil Challis / Young Long-tailed macaque (Macaca fascicularis) sitting and biting its own toes, Central Thailand, June.

Neil Challis / Long-tailed macaque (Macaca fascicularis) mother grooming leg of infant on branch, Central Thailand, June.

Neil Challis / Long-tailed macaque (Macaca fascicularis) mother grooming head of infant on branch, Central Thailand, June.

Neil Challis / Close up of Long-tailed macaque (Macaca fascicularis) male sleeping in a tree, Central Thailand, June.

Neil Challis / Long-tailed macaque (Macaca fascicularis) foraging for food on muddy banks, Southern Thailand, March.

Neil Challis / Common butterfly lizard (Leiolepis belliana) mother emerging from burrow with its babies, Southern Thailand, March.

Neil Challis / Mudskipper (Periophthalmus) displaying with pectoral fin at the entrance to its hole, Southern Thailand, March.

Vishal Jadhav / Lesser banded hornet (Vespa affinis) workers entering and exiting their nesting hole, Maharashtra, India, May.

Vishal Jadhav / Great hornbill (Buceros bicornis) male feeding the female fig fruits as she sits on the nest inside tree trunk, before jumping around the nest hole, Maharashtra, India, April.

Vishal Jadhav / Great hornbill (Buceros bicornis) male feeding the female fig fruits as she sits on the nest inside tree trunk, Maharashtra, India, April.

David Weiller / Slug moth caterpillars (Acharia hyperoche) shedding skin on a palm leaf, Golfito, Costa Rica, March.

David Weiller / Slug moth caterpillar (Acharia nesea) walking beside two Ichneumon wasp (Ichneumonidae spp.) cocoons with the remains of two parasitised caterpillars on a palm leaf, Golfito, Costa Rica, March.

Vishal Jadhav / Black-rumped flameback woodpecker / Lesser golden-backed woodpecker (Dinopium benghalense) mother feeding her chick in the nesting hole, Maharashtra, India, April.

Vishal Jadhav / Siberian stonechat (Saxicola maurus) female catching and eating an ant from its perch, Maharashtra, India, March.

Vishal Jadhav / European roller (Coracias garrulus) perched on a rock preening its feathers, Maharashtra, India, February.

Vishal Jadhav / Coppersmith barbet (Psilopogon haemacephalus) hanging upside down on a fruiting tree, filling its beak with berries to take back to the nest, then hops away, Maharashtra India, April.

Simon Littlejohn / Eurasian griffon vulture (Gyps fulvus) regurgitating food, before the chick falls onto its back, parent tries to help, Casares, Andalusia, Spain, March.

Simon Littlejohn / Eurasian griffon vulture (Gyps fulvus) in nest with a one-week-old chick nestled under its breast plumage moving round, Casares, Andalusia, Spain, March.

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) defacating by hanging from thumbs the 'right way up', Yarra Bend Park, Victoria, Australia, April.

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) aggressive mating behaviour (wrestling, biting) male eventually moves away, Yarra Bend Park, Victoria, Australia, April.

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) male involved in courtship / mating behaviour including licking female's genitalia; male grooming his own penis, bickering and female climbing away, Yar...

Neil Challis / Little grebe (Tachybaptus ruficollis) chasing a small fish jumping out of the water, before finally catching then eating it, Western Thailand.

Neil Challis / Giant golden orb weaver spider (Nephila pilipes) focus pull from a small male to much larger female in the background, Western Thailand.

Neil Challis / Two juvenile Long-tailed macaques (Macaca fascicularis) play fighting in a tree during a shower, Western Thailand.

Neil Challis / Weaver ant (Oecophylla sp.) workers using their mandibles to pull two leaves together as part of their nest building process, Western Thailand.

Neil Challis / Weaver ants (Oecophylla sp.) attacking and pulling the legs of a Formicine ant (Polyrhachis proxima) on the forest floor, Western Thailand.

Neil Challis / Weaver ants (Oecophylla sp.) pulling apart a Kapok bug (Probergrothius nigricornis) and carrying it back to their nest, Western Thailand.

Neil Challis / Asian water monitor (Varanus salvator) swimming through lake, early morning, Western Thailand.

Neil Challis / Asian water monitor (Varanus salvator) emerging from water, then crossing land, before swimming away, Western Thailand.

Marie Read / Ruby-throated hummingbird (Archilochus colubris) male flies in to feed on nectar from Eastern red columbine flower (Aquilegia canadensis), Freeville, New York, USA, June.

Marie Read / Eastern bluebird (Sialia sialis) male feeding on Winterberries (Ilex verticillata) before flying off, Freeville, New York, USA, January.

Marie Read / Common loon (Gavia immer) adult swimming with a chick resting on its back, Presque Isle County, Michigan, USA, June.

Marie Read / American bittern (Botaurus lentiginosus) calling / booming in a cattail marsh to mark territory, Salt Alkaline Lake, Kidder County, North Dakota, USA, June.

Lukas Schaefer / Sunrise timelapse of clouds sweeping over the Dolomites mountain range at dawn, Fanes Sennes Braies National Park, Italy, May.

Lukas Schaefer / Rock ptarmigan (Lagopus muta) close up preening, Val Venosta, Italy, October.

Lukas Schaefer / Alpine ibex (Capra ibex) male walking up a mountain in the snow, Gran Paradiso, Italy, December.

Vishal Jadhav / Exhausted Short-eared owl (Asio flammeus) surrounded by House crow (Corvus splendens) group at dawn, one crow dives down to attack, Maharashtra, India, April.

Vishal Jadhav / Short-eared owl (Asio flammeus) stood surrounded by a group of House crows (Corvus splendens) trying to find weakness by snapping at its feathers, Maharashtra, India, April.