Birgitte Wilms / Fish with parasites and lice

Mark Moffett / Weaver Ant (Oecophylla longinoda) group grab an adjacent leaf and stem with mandibles and toes and pull, gradually binding them together, Malaysia

Heike Odermatt / Southern Elephant Seal (Mirounga leonina) sub-adult male, Falkland Islands

Cyril Ruoso / Przewalski's Horse (Equus ferus przewalskii) sub-adult males fighting, Gobi Desert, Mongolia

Cyril Ruoso / Przewalski's Horse (Equus ferus przewalskii) sub-adult males play-fighting, Gobi Desert, Mongolia

Cyril Ruoso / Przewalski's Horse (Equus ferus przewalskii) sub-adult males along release enclosure fence, Gobi Desert, Mongolia

Jack Jeffrey/ BIA / I'iwi (Drepanis coccinea) juvenile feeding on flower nectar, Hawaii

Glenn Bartley / Purple Gallinule (Porphyrio martinicus) juvenile, Ecuador

Hiroya Minakuchi / Tree Dragon (Gonocephalus sp) juvenile, Malaysia

Hiroya Minakuchi / Japanese Macaque (Macaca fuscata) juvenile in hot spring, Jigokudani, Japan

Hiroya Minakuchi / Proboscis Monkey (Nasalis larvatus) jumping from tree, Saba, Malaysia

Hiroya Minakuchi / Proboscis Monkey (Nasalis larvatus) jumping from tree, Saba, Malaysia