>Geese chased out of a park in Chicago returned to the area twice as quickly on days when they were harassed, compared with days when they left of their own accord
Because the reason they left was no longer valid, whereas when they left of their own accord presumably the reason was still valid (had eaten all the food, bad nesting, noise etc)
Because the reason they left was no longer valid, whereas when they left of their own accord presumably the reason was still valid (had eaten all the food, bad nesting, noise etc)