Crow

The true crows are huge passerine birds that comprise the genus Corvus. Ranging in size from the comparatively small pigeon-sized jackdaws (Eurasian and Daurian) to the Common Raven of the Holarctic region and Thick-billed Raven of the highlands of Ethiopia, the 40 or so members of this genus happen on all temperate continents (except South America) and numerous offshore and oceanic islands (including Hawaii).

In literary and fanciful usage, the communal noun for a group of crows is a murder. However, in practice most people, and particularly scientists, use the more generic term flock.
There is no good methodical approach to the genus at present. Generally, it is assumed that the species from a geographical area are more intimately related to each other than to other lineages, but this is not necessarily right. For example, while the Carrion/Collared/House Crow complex is surely closely related to each other, the situation is not at all clear regarding the Australian/Melanesian species.

The Neogene fossil record of crows is quite dense in Europe, but the relationships among most prehistoric species are not clear. Jackdaw-, crow- and raven-sized forms seem to have existed since long ago and crows were frequently hunted by humans up to the Iron Age, documenting the development of the modern taxa. American crows are not as well-documented.

A amazingly high number of species have become dead after human colonization; the loss of one prehistoric Caribbean crow could also have been connected to the last ice age's climate changes.
A very partial list includes the eponymous Pacific Northwest Native figures Raven and Crow, the ravens Hugin and Munin, who accompany the Norse god Odin, the Celtic goddesses the Mórrígan and/or the Badb (sometimes measured separate from Mórrígan), and Shani, a Hindu god who travels spanning a crow. In Greek mythology, it was supposed that when the crows gave bad news to the goddess Athena, she flew into a rage, and cursed their feathers to be black. Myths in India -Hindu it is supposed that people who died will take food and offerings through a diversity of crows called "Bali kkakka". Every year people whose parents or relatives died will present food to crows as well as cows on the Shradha day.

useful links: transport rankings