Shane Gross / Bottlenose dolphin (Tursiops truncatus) underwater rubbing herself on a sponge off Eleuthera, Bahamas.
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Nick Upton / Grey seal (Halichoerus grypus) pup aged one month, rubbing its head with its flipper, yawning and settling down to rest on a sandy beach, Norfolk, England, UK, January.
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Danny Green / Atlantic Puffins (Fratercula arctica) bill rubbing, Skomer Island, Wales, UK, April
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Danny Green / Atlantic Puffin (Fratercula arctica) pair bill rubbing part of courtship ritual, Skomer Island, Wales, UK, May
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Tony Wu / Four Sperm whales (Physeter macrocephalus) rubbing their heads together while socializing, forming an X shape pattern. Caribbean.
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Tony Wu / Four Sperm whales (Physeter macrocephalus) rubbing their heads together while socializing, hanging down. Caribbean.
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Tony Wu / Sperm whales (Physeter macrocephalus) large group gathering together, rubbing together to shed skin, interacting and defecating. Indian Ocean, March.
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Tony Wu / Family of Sperm whales (Physeter macrocephalus) engaged in social activity, rubbing against each other, Indian Ocean, March.
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Matthias Breiter / Polar Bear (Ursus maritimus) male rubbing against snow, Hudson Bay, Manitoba, Canada
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Donald M. Jones / Elk (Cervus elaphus) bull rubbing tree during rut, western Canada
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Anup Shah / African Lion (Panthera leo) female with cubs, Masai Mara, Kenya