{"fact":"Unlike ravens, crows tolerate sharing their home ranges with other crows, leading to higher crow densities near human settlements.","context":"This occurred despite crows having home ranges three times larger than ravens when nesting within 1 km of human settlements and campgrounds. Thus, an ability to utilize anthropogenic resources to increase reproduction and survivorship appears necessary but not sufficient to increase local corvid populations. Local density increases depend on an ability to reduce home range size and/or tolerate overlap in home ranges, both of which were done by crows.","source":"John M. Marzluff; Erik Neatherlin, Corvid response to human settlements and campgrounds: Causes, consequences, and challenges for conservation, 10.1016/j.biocon.2005.12.026","index":137}