Konstantin Mikhailov / Domestic chicken {Gallus gallus domesticus} cock crowing, portrait showing comb and wattle, Western Caucasus, Russia

Jane Burton / Domestic chicken, White leghorn cockerel crowing.

Jane Burton / Light Sussex Bantam cockerel {Gallus gallus domesticus} crowing.

Jane Burton / Cockerel / Rooster {Gallus gallus domesticus} crowing. Captive, UK.

Mitsuaki Iwago / Domestic Chicken (Gallus domesticus) male crowing, North America

Heidi & Hans-Juergen Koch / Domestic Chicken (Gallus domesticus) rooster crowing, northern Germany

Jussi Murtosaari / Hooded crow (Corvus cornix) perched on branch crowing at a roosting Eurasian eagle-owl (Bubo bubo), Finland. January.

Lynn M. Stone / Serama rooster crowing in spring garden, Ashford, Connecticut, USA. May.

Yves Lanceau / Faverolles Hen, cock crowing, studio portrait

Yves Lanceau / Padoue White Padovana Hen, cock crowing, studio portrait

Yves Lanceau / Brahma Hen, blue, cock crowing, France

Yves Lanceau / La Fleche Hen, Andalusian blue, cock crowing, studio portrait