AMCR meaning in General ?

The American crow (Corvus brachyrhynchos) is a large passerine bird species of the family Corvidae. It is a common bird found throughout much of North America.American crows are the New World counterpart to the carrion crow and the hooded crow. Although the American crow and the hooded crow are very similar in size, structure and behavior, their calls and visual appearance are different. The American crow, nevertheless, occupies the same ecological niche that the hooded crow and carrion crow do in Eurasia.

From beak to tail, an American crow measures 40–50 cm (16–20 in), almost half of which is tail. Mass varies from about 300 to 600 g (11 to 21 oz). Males tend to be larger than females.The most usual call is CaaW!-CaaW!-CaaW!.

The American crow is all black, with iridescent feathers. It looks much like other all-black corvids. They can be distinguished from the common raven (C. corax) because American crows are smaller, from the fish crow (C. ossifragus) because American crows do not hunch and fluff their throat feathers when they call and from the carrion crow (C. corone) by size, as the carrion crow is larger and of a stockier build.

American crows are common, widespread, and susceptible to the West Nile virus, making them useful as a bioindicator to track the virus's spread. Direct transmission of the virus from crows to humans is impossible.