Anup Shah / Dusky leaf monkey (Trachypithecus obscurus) juvenile yawning . Khao Sam Roi Yot National Park, Thailand. March 2015.
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Anup Shah / Long-tailed macaque (Macaca fascicularis) juvenile sticking tongue out. Khao Sam Roi Yot National Park, Thailand.
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Juergen Freund / Banded archerfish (Toxotes jaculatrix) spitting, Oolioo Sandbar, Territory Wildlife Park, Berry Springs, Northern Territory, Australia.
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Cyril Ruoso / Adult male Drill (Mandrillus leucophaeus) yawning, mouth wide open showing canine teeth, Pandrillus Sanctuary, Nigeria. Non-ex
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Ole Jorgen Liodden / Hippopotamus (Hippopotamus amphibius) rearing head out of water, creating spray, Lake Naivasha, Kenya.
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Anup Shah / Celebes / Black crested macaque (Macaca nigra) sub-adult male yawning, Tangkoko National Park, Sulawesi, Indonesia.
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Andy Rouse / Masai giraffe (Giraffa camelopardalis tippelski) showing long tongue, captive, Marwell Zoo, UK
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Mark Taylor / RF- Chesapeake Bay Retriever dog, Teague, yawning. (This image may be licensed either as rights managed or royalty free.)
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Andy Rouse / RF- African lion (Panthera leo) females greeting, Kenya. (This image may be licensed either as rights managed or royalty free.)
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Staffan Widstrand / RF- Bengal tiger yawning (Panthera tigris tigris). Bandhavgarh National Park, India. (This image may be licensed either as rights managed or royalty free.)
