Terry Whittaker / Water vole (Arvicola amphibius) swimming underwater, dragging nesting material back to its burrow, Kent, England, UK. October.
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Laurie Campbell / Northern gannet (Morus bassanus) gathering nesting material, Bass Rock, Firth of Forth, East Lothian, UK, July
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Ashley Cooper / Long-tailed tit (Aegithalos caudatus) gathering feathers for nest. May.
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George Sanker / Great egret (Ardea alba) in flight with twig in beak, refurbishing nest. Venice Area Audubon Rookery, Florida, USA. March.
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George Sanker / Great egret (Ardea alba) in flight with twig in beak, refurbishing nest. Venice Area Audubon Rookery, Florida, USA. March.
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John Chan / Great blue heron (Ardea herodias) gathering nesting material, Southern California, USA.
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John Chan / Great blue heron (Ardea herodias) breaking off a branch, gathering nesting material, Southern California, USA, February.
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John Chan / Great blue heron (Ardea herodias) trying to break off branches to use for building nest, Southern California, USA, February.
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Sven Zacek / Silhouette of Red squirrel (Sciurus vulgaris) gathering nesting material for winter nest. Ida-Virumaa, Eastern Estonia. November.
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Sven Zacek / Great crested grebe (Podiceps cristatus) pair in courtship weed dance, presenting potential nesting material to each other after diving. Otepaa Nature Park, Valgamaa, Estonia. April.
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Paul Hobson / Robin (Erithacus rubecula) female with nesting material in beak, perched on old gate. Sheffield, England, UK. March.
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Mike Read / Atlantic puffin (Fratercula arctica) with nesting material in beak. Lunga Island, Treshnish Isles, Firth of Lorn, Inner Hebrides, Argyll and Bute, Scotland, UK. May.