John Chan / Male California least tern (Sternula antillarum browni) presenting fish offering to female during mating, Huntington Beach, California, USA, May.
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Nick Upton / Ivy bee (Colletes hederae) mating ball, showing a mass of males clustered around a female recently emerged from her burrow, Wiltshire, England, UK, September.
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Nick Upton / Two Red fox (Vulpes vulpes) cubs playing near the entrance to their den at dusk, Somerset, England, UK, May.
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Nick Upton / European eel (Anguilla anguilla) elver migrating upstream, using an eel pass on the side of a weir, Somerset Levels, England, UK, July.
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Nick Upton / Male Eurasian beaver (Castor fiber) grazing at dusk, River Otter, Devon, England, UK, June.
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Nick Upton / Tilt shot of a dam constructed by Eurasian beavers (Castor fiber) on a section of the River Otter, Devon, England, UK, June 2018.
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John Cancalosi / Rain storm in the Sonoran desert, with Saguaro cacti (Carnegiea gigantea), near Tucson, Arizona. 2018.
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John Cancalosi / American toads (Anaxyrus americanus), several males competing to mate with female, Maryland, USA, April.
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David Perpinan / Male Mediterranean tree frog (Hyla meridionalis) calling, showing vocal sac inflating, Barcelona, Spain, May. Filmed at night with an infrared camera.
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Brian Bevan / Male Green woodpecker (Picus viridis) feeding young at nest hole, shot looking up trunk, Bedfordshire, England, UK, June.
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Paul Souders/ Worldfoto / Humpback Whale (Megaptera novaeangliae) pod cooperative bubble-net feeding, Frederick Sound, Alaska
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Paul Souders/ Worldfoto / Humpback Whale (Megaptera novaeangliae) pod cooperative bubble-net feeding, Frederick Sound, Alaska
