Crop milk is a secretion from the lining of the crop of parent birds that is regurgitated to young birds. It is found among all pigeons and doves where it is referred to as pigeon milk. An analog to crop milk is also secreted from the esophagus of flamingos and the male emperor penguin. D

A columbarium (pl. columbaria) is a structure for the reverential and usually public storage of funerary urns holding cremains of the dead. The term comes from the Latin columba (dove) and originally solely referred to compartmentalized housing for doves and pigeons, also called dovecotes