John Chan / Male California Least Tern (Sternula antillarum browni) courting a female, presenting a fish before chasing off another male, Huntington Beach, California, USA, May.
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Frederique Olivier / Pair of Blue footed boobies (Sula nebouxii) courting, with the male picking up and offering grass, Isla Lobos de Terra, Peru.
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Danny Green / Atlantic Puffin (Fratercula arctica) coming out of its burrow with a gift, Skomer Island, Wales, UK, May
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Krijn Trimbos / Great crested grebe (Podiceps cristatus) pair in 'weed dance' courtship display, The Netherlands, March.
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David Pattyn / Great crested grebe (Podiceps cristatus) pair performing their 'weed dance' in which they take a vertical position in front of each other and offer plant material to each other. The Netherlands. March...
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David Pattyn / Great crested grebe (Podiceps cristatus) pair performing their 'weed dance' during the courting or mating season. The birds offer each other plant material as a present to confirm their bond. The Neth...
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David Pattyn / Great crested grebe (Podiceps cristatus) pair performing their 'weed dance' during the courting or mating season. The birds offer each other plant material as a present to confirm their bond. The Neth...
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David Pattyn / Great crested grebe (Podiceps cristatus) pair performing their spectacular 'weed dance' during the courting or mating season. The birds offer each other plant material as a present to confirm their bo...
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David Pattyn / Great crested grebe (Podiceps cristatus) pair performing their 'weed dance' during the courting or mating season. The birds offer each other plant material as a present to confirm their bond. The Neth...
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David Pattyn / Great crested grebe (Podiceps cristatus) pair performing their spectacular 'weed dance' during the courting or mating season. The birds offer each other plant material as a present to confirm their bo...
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Staffan Widstrand,Staffan Widstrand / Mangrove planting team from CRINEO planting Rhzophora mangrove trees, Pulicat Lake, Tamil Nadu, India, February 2013.
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Rolf Nussbaumer / RF- Vermilion Flycatcher (Pyrocephalus rubinus) male giving insect to female for young in nest. Lake Corpus Christi, Texas, USA. May. (This image may be licensed either as rights managed or royalty fr...
