1. They won't hesitate to stare you down. The American crow has several predators to be wary of, including the raccoon, the owl and the hawk. However, full-grown crows aren’t typically preyed upon by ground animals, so crows standing on the sidewalk won’t be nearly as on-guard as they would be perched on a treetop.Like most urban animals, crows living in cities and towns have gotten used to having lots of humans walking around and watching them. They’re not worried about the average human attacking them, and so they’ll let you get within feet of them before hopping down the sidewalk. Of course, they still keep an eye on you to make sure that you’re not the dangerous exception to the rule. 2. A group of crows is called a MURDER. It’s not uncommon to see groups of 3-5 crows foraging together: Crows live in territorial breeding pairs, and the adolescent offspring of a nest often remain on their parents’ territory until maturity, helping to take care of younger siblings. Both biparental and sibling care of young are rare in the animal kingdom; crows are a lot like us in this way!At night, crows gather together in the hundreds to sleep: this gigantic murder is called a roost. Crows are most vulnerable at night, and being part of a roost means that each individual crow is much safer from predators. Roosts can be a little noisy in the early evening—this is the perfect time to socialize—but don’t worry: they’ll quiet down by nightfall. 3. They don't attack alone. When a crow sights a potential danger to itself or its nestlings, it calls other crows to the area and they attempt to scare away the threat in an action called “mobbing.” They scold the threat with harsh cawing noises and take dives, avoiding actual contact but getting close enough to the offender to show that they mean business. When a simple scare will do, authentic skirmishing puts the crow in a lot of unnecessary risk, so they focus on intimidating the predator and getting it to fly (or run) away. 4. They hold a grudge. Scientists have found that when a human wearing a realistic mask presents itself as a threat, either by capturing a live crow or carrying a dead one, any crows in the area will respond by mobbing the human. Even more exciting is that crows will remember the mask, and continue to treat it as an active threat for at least three years.Crows communicated the danger of the mask, as well. When new crows were called into the mob, they learned the features of the predator and were able to recognize it themselves. A single attack on one crow can eventually lead to anti-predatory behavior from an entire population. 5. They eat freshly dead meat. Crows are well-known omnivores, opportunistically foraging wherever there is food. A typical diet consists of many seeds, nuts and fruit, as well as grubs and insects and some larger animals, like other species' nestlings. 6. They have the dastardly cunning of Hannibal Lecter. Crows are one of the smartest birds on earth, and have been compared to primates in brain function. Use of tools among many crow species is well-documented, as well as a variety of behaviors that can only be explained as play. A famous example of crows’ intelligence is a crow named Betty. Betty was given a piece of wire and a food source by the researchers, and shown how to access the food with a small hook. On her own, she toyed with the wire until it made a hook, then accessed the food source. This is all remarkable behavior for avian species. They’re not all so bird-brained after all! 7. They are pitch-black from head to toe. The color of pure evil.