Ingo Arndt / Baya weaver (Ploceus philippinus) subadult birds practising building 'play nest', Singapore.

Ingo Arndt / Baya weaver (Ploceus philippinus) male flying to nest entrance, Singapore

Staffan Widstrand / Wild Wonders of China / Baya weaver (Ploceus philippinus) on its nest, Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China. May

Staffan Widstrand / Wild Wonders of China / Baya weaver (Ploceus philippinus) on its nest in Tongbiguan Nature Reserve, Dehong Prefecture, Yunnan province, China, May.

Staffan Widstrand / Wild Wonders of China / Baya weaver (Ploceus philippinus) on its nest in Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China, May.

Staffan Widstrand / Wild Wonders of China / Baya weaver (Ploceus philippinus) on its nest in Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China. May

Ingo Arndt / Baya weaver nest (Ploceus philippinus) detail of woven grass at nest entrance, Singapore.

Ingo Arndt / Baya weaver (Ploceus philippinus) subadult birds practising building 'play nest', Singapore.

Hanne & Jens Eriksen / Baya weaver (Ploceus philippinus) group lined up on branch, India, February

Nigel Bean / Baya Weaver bird building nest (Ploceus philippinus) Pakistan

Aishwarya Sridhar / Baya weaver (Ploceus philippinus) male, perched at entrance to hanging nest, Uran, Maharashtra, India.

Aishwarya Sridhar / Baya weaver (Ploceus philippinus) male, weaving nest during the breeding season, Uran, Maharashtra, India.