Forest habitats are adequate for crow survival but agricultural lands and suburbia are even better. The adaptable crow can exploit farming waste and human-generated trash in addition to more natural food sources. Crows are very intelligent animals and, if trained, can learn to mimic the human voice and use simple tools to manipulate objects. They have acute senses of sight and hearing and very good memories. They are also fascinated with and will collect shiny objects such as keys, rings and foil.
Crows do prey on young birds and eggs during the spring mating season.
They can be very aggressive to other birds and mammals. Apparently, this group unity imposes demands of regimentation, as ill, injured and old crows are driven from the flock and often killed. Perhaps, because crows function as a group and the safety of the group depends in large measure upon unity and conformity within the group, it becomes important that all function together. Flocks of crows often roost together during the night and then separate to feed during the day. Some birds will visit the same areas each day to feed while others have no apparent routine.