Hybrids, when they do occur, have plumage that is intermediate between their two parents, which makes them unattractive to birds of either population. It seems that what keeps them apart is their sexual preferences. For the most part, though, they don’t mix. What keeps carrion and hooded crows apart?Ĭarrion and hooded crows may look very different, but they are almost indistinguishable genetically and behaviourally, and are quite capable of interbreeding and producing fertile offspring. This Q&A originally appeared in BBC Wildlife, and was answered by Stuart Blackman. It is a small step to see a group of crows, attracted to a corpse, not as scavengers but as agents of death with murderous intentions. There is, for example, the belief that crows peck out the eyes of their ‘victims’ to attain their excellent vision. In fact some of this mythology was originally associated with ravens but, given the considerable difficulties that many people have in identifying black corvids, it is understandable that traditions were transferred between the species. Such an association with death saw the development of folklore and superstition, causing the birds to be viewed less than favourably.

Historically the presence of the gallows and slaughter on the battlefields would have provided rich pickings for our two species of crow. The origin of the term ‘murder’ meaning a flock of crows has much to do with the scavenging nature of this and other corvids. Read Dr Jo Wimpenny's piece exploring whether they deserve this reputation. Are corvids clever?Ĭorvids have a reputation for being intelligent birds, with various species having been shown to be able to use tools, recognise themselves in the mirror, being aware that they may be being watched, and remember human faces. This Q&A originally appeared in BBC Wildlife, and was answered by David Lindo. They can be seen in urban areas, such as downtown Los Angeles, and in the mountains, for example, up at 4,998m in the Himalayas. The birds can be found throughout the Holarctic, from the Arctic to the temperate habitats of North America and Europe, to the deserts of Africa.

The raven (also known as the northern or common raven) thrives in a variety of climates, not just the classic colder climes of the north. What is the most widespread crow species in the world?

Fluctus vs corvus