(Squad Passeriformes, Family Corvidae Family, Genus Raven)
Although there are two species of crow - grey and black, systematics in the last time who would be inclined to take them both to a single species, Corvus corone, with two subspecies: hooded crow (Corvus corone cornix) and carrion crow (Corvus corone corone). They differ, in General, only the color of plumage: black Raven covered, respectively, entirely black feathers, while the crow grey feathers everywhere except the head, front, wings and tail are grey. Apparently, black and grey crows are able to interbreed with one another and give a full-fledged offspring.
Crows are the most familiar species of Corvidae, because large concentrations of these birds characteristic of the cities of Central Russia. In cities crows form mixed flocks with rooks and jackdaws. Usually, the night they spend in the city centre - in the parks and on rooftops, and on the day fly out to feed on the outskirts of the city and its surroundings.
The ravens prefer to settle close to people - they have become in the fullest sense of the word "citizens". That's only in very environmentally disadvantaged towns can be found only in adults and no crow nests - these Chicks are smart and sensitive creation deduce where the air is less gassy, but fed still arrive in the city. Thus, the appearance of crow's nest - a sure sign of improvement of ecological situation in the industrial settlement and often coincides with the decline of production in large enterprises.
Crows are omnivores: eat rodents, do not miss a chance to eat worms and bugs or to catch fish, steal someone else's eggs, are living in the city dump, don't refuse and carrion. However, they are willing to dilute their diet of plant food in the form of seeds, leaves and fruits. Restuccia from waste and landfill rotting remains of food waste, crows contribute to the separation of any infection.
The harm caused black birds and small animals, explicitly puts it in the category of predators. So, the growth in the number of grey crow has resulted in the Park and forest areas of the city rare steel starlings, disappeared chaffinches and goldfinches, less fly other types of birds. The fact that the grey crow Chicks during the first weeks of their lives need to be energy-dense and easily digestible biological stern. It becomes disastrous for posterity many other birds, because their eggs are the main feed baby crows. Even birds that nest in tree holes, bird houses and attics, have tight, because the crow will not miss the opportunity to watch grown juveniles. No wonder the crow got its name - THIEF IT!
However, eating small rodents and harmful insects crow brings benefit.
The mating season at the Raven begins closer to spring. Joint building nests and laying eggs precede exciting mating games, which are usually expressed in a variety of aerobatics performed by males. Construction family housing starts by the end of March. The crows nest is built in forks of branches of large trees or on the roofs of houses. Building material are not only natural components such as branches, but the wire, rags, scraps of wool - ravens widely used civilization, integral part of which they have become.
The usual clutch of 4-6 eggs, bluish-green, dotted. Hatching Chicks is the prerogative of the mother, father feeds girlfriend during this period. After about 25-30 days appear helpless nestlings. Now both parents become their caregivers.
It is believed that during nesting crows behave very carefully, trying not to give away the location of the nest by their presence.
And they extremely don't like to pose. If, for example, pigeons, seeing the camera, do not pay it absolutely no attention, continuing to quietly go about their business, the ravens immediately dart, hurriedly away out of sight. Crows with striking flair is distinguished by just walking man from nature lover who has decided for them to watch, and in a hurry to retreat away from such a naturalist.
With regard to the content of the manual ravens in the house is amazingly interesting and very smart pet. When feeding a person with a tender age this bird a strong attachment to the family in which he grew up. Under the family during this refers to all beings living in the house, including the animals. Of course, for the ravens is preferable to put it himself the head of "his" family.
Manual crow's no need to stay in the cage. It may well be independent, departing on trips and returning home when tired or hungry. Training crows to onomatopoeia, too, is not very difficult: it is easy to study human speech, quite loudly and clearly saying the words.