Edwin Giesbers / Saltwater crocodile (Crocodylus porosus) close up portrait, Sarawak, Borneo, Malaysia

Edwin Giesbers / Lemon-yellow tree frog (Hyla savignyi) Cyprus. April.

Steve Downer / Yellow slug larva (Limax flavus) emerging from an egg case, controlled conditions.

Steve Downer / Yellow slug larva (Limax flavus) emerging from an egg case, controlled conditions.

Ingo Arndt / Oleander hawkmoth caterpillar showing eye spots for defense {Daphnis nerii}

Markus Varesvuo / Snowy owl (Bubo scandiaca) female face close up, Canada February

Andy Sands / Jumping spider (Evarcha arcuata) on edge of evening primrose flower, Surrey, England, UK, August

Wim van den Heever / Lion (Panthera leo) male with scars photographed with side-lit spot light at night. Greater Kruger National Park, South Africa, April.

Wim van den Heever / Lion (Panthera leo) male in darkness, Okavango Delta, Botswana.

Alex Mustard / Harlequin sweetlips (Plectorhinchus chaetodonoides) cleaned by a pair of bluestreak cleaner wrasse (Labroides dimidiatus). South Atoll, Tubbataha Atolls, Tubbataha Reefs Natural Park, Palawan, Philipp...

Jack Dykinga / Great horned owl (Bubo virginianus) chicks nesting in saguaro cactus (Carnegiea gigantea), near Oracle, Sonoran Desert, Arizona, USA, May.

Gabriel Rojo / Puma (Puma concolor) hidden in vegetation, captive, La Pampa , Argentina