The Hooded Crow (Corvus cornix) is a Eurasian bird species in the crow genus. Found across Northern, Eastern and Southeastern Europe, as well as parts of the Middle East, it is an ashy grey bird with black head, throat, wings, tail and thigh feathers, as well as a black bill, eyes and feet. Like other corvids it is an omnivorous and opportunistic forager and feeder.
Nesting occurs later in colder regions: mid-May to mid-June in northwest Russia, Shetland and the Faroe Islands, and late February in the Persian Gulf region. In warmer parts of the British Isles, the clutch is laid in April. The bulky stick nest is normally placed in a tall tree, but cliff ledges, old buildings and pylons may be used. Nests are occasionally placed on or near the ground. The nest resembles that of the Carrion Crow, but on the coast seaweed is often interwoven in the structure, and animal bones and wire are also frequently incorporated. The four to six brown-speckled blue eggs are 4.3 x 3.0 centimetres (1.7 x 1.2 in) in size and weigh 19.8 grammes (0.71 oz), of which 6% is shell. The altricial young are incubated for 17–19 days by the female alone, who is fed by the male. They fledge after 32 to 36 days. Incubating females have been reported to obtain most of their own food and later that for their young.
Source: en.wikipedia.org/wiki/Hooded_Crow - 29.11.2011
The Hooded Crow is, together with the Carrion Crow, a subspecies of the Corvus corone. Thus it comes clear, that in forward lap regions constantly hybrids grow up, which are procreative.