The term "roughness" is not the only name used to describe a group of crows. It is believed that a group of crows are called rude because in the 19th century, many people believed that these birds were not so caring when it came to their young. The rudeness of ravens may be due to the 19th-century false belief that birds weren't the most caring parents, sometimes driving their young out of their nests so they can take care of themselves long before they were ready. The term is due to the intelligence and ingenuity of crows.
One could easily compare the crow's name to a classic case of negative coverage of birds, because it's clear that aside from their negative traits, these birds are still one of the most fascinating creatures of all. Not only do crows have a bad reputation, but crows in general, when they come in packs, are called killer crows. It is equally absurd to claim that a flock of crows can be called murder. In fact, murder is not the only collective name for a flock of crows.
Collective names for a group of crows (or at least common crows) include "rave", , "betrayal", , "rude"  and "conspiracy". Many birds are described by pleasant or noble collective names such as "charming finches" or "council of owls," but a flock of crows is called a conspiracy. Many flock names describe not only a group of birds, but also their behavior or personality.
A group of waders, however, is only a flock if the crowd is mixed with herons, godwit, egrets, flamingos, storks and plovers, as herons have different collective names for their species. Birds do not just form organized groups called flight flocks. The largest group of crows is known as a "flock". These flocks usually form during the winter season and feed to collect food.
Ravens are omnivorous birds that most often travel in pairs or large groups. Although adult crows have been trained by their parents to forage for food, being in a group means that if a crow finds food, everyone is eaten. In winter, crows may gather in groups in search of food, spending the night sitting.
In addition to this, due to their size and coloration, it is believed that watching a large flock of crows can be stressful for other birds. For example, scientists have found that if they observe or befriend a crow, the other crows in their group are more friendly to that member. Because of their resemblance to crows and ravens, thrushes are also called murder, cruelty, or murder.
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