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...

Andrew Parkinson / Great crested grebe (Podiceps cristatus) pair during part of their elaborate courtship called the 'weed dance', Derbyshire, UK, March

Marie Read / Clark's grebes (Aechmophorus clarkii) courting pair performing the 'Weed Ceremony' in which they slowly circle breast to breast holding pond weed as nesting material, Lake Hodges, Escondid...

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.

David Pattyn / Great crested grebe (Podiceps cristatus) performing their 'weed dance' during courtship. Den Oever, The Netherlands. July

Andy Rouse / Pair of backlit Great crested grebes (Podiceps cristatus) courting, weed dance, Cardiff, Wales, UK, March.

Andy Rouse / Pair of Great crested grebes (Podiceps cristatus) courting, weed dance, Cardiff, Wales, UK, March.

Andy Rouse / Great crested grebes (Podiceps cristatus) pair in courtship 'weed dance' in morning light, Wales, UK, February.

Andy Rouse / Great crested grebes (Podiceps cristatus) pair in courtship 'weed dance' in morning light, Wales, UK, February. Highly commended in the BWPA (British Wildlife Photography Awards) Competition 2016.

David Pattyn / Great Crested Grebe (Podiceps cristatus) pair in courtship weed dance during courtship close to a reedbed. The Netherlands. April.

Andy Rouse / Great crested grebe (Podiceps cristatus cristatus) courtship weed dance, Cardiff, UK, March.

Andy Rouse / Great crested grebe (Podiceps cristatus cristatus) courtship weed dance at dawn, Cardiff, UK, March.