"Solitude is a human presumption. Every quiet step is thunder to beetle life underfoot, a tug of impalpable thread on the web pulling mate to mate and predator to prey, a beginning or an end. Every choice is a world made new for the chosen."This observation jumps off the page and into the field in a recent study of crows by University of Washington biologists, who found that the birds can recognize and remember human faces and hold grudges against the ones that previously upset them (in this case, by banding them).
Read the accompanying article on New Scientist.