The Collared Dove, also called the Eurasian Collared Dove to distinguish from the African Collared (Ringneck) Dove has somewhat greyer plumage than its African cousin, a slightly pinker breast, darker "primaries" (dark brown/black wingtips), is slightly larger and has a "coo" sound rather than a "purr". Both (as adults) have the black half-collar bordered with white and look a little similar.
Like many birds, they form lasting pair bonds. They also often congregate in flocks.
On the nest; males and females have similar plumage.
The pinkish breast, white-bordered black undertail and "garnet" eyes.
The half collar and dark wingtips (primaries)
(Eurasian) Collared Doves have spread across the European continent in recent years, colonising the UK as late as the 1950s and still successfully increasing their range
Smaller (slimmer) than the Feral Pigeon
Naturally white ("leucistic", not entirely white and not albino)
African Collared Dove/ Barbary Dove
Streptopelia roseogrisea/ risoria
The African Collared Dove, sometimes called the Barbary Dove although that name is also applied to the similar domestic Ringneck species, is slightly smaller than the Eurasian, with browner, creamier plumage without contrasting dark wingtips (primaries). It has the same half-collar and garnet eyes. The tame domestic Barbary Dove is almost identical but nearer the Eurasian in size.
(The domestic Barbary has been bred with various plumage shades including all white, without collar, popular for stage shows -- see white dove link below.)
The wingtips are closer to the body colour. Head is a little grey rather than brown. The European and African Collared Doves live side by side in the Canary Islands and hybrids are common.