Pellet Regurgitation by Captive Sparrow Hawks (Falco sparverius)

“remember” the exact location of nest boxes, since in the spring, if the box has not yet been put up, they will flutter around where it was the previous year. Nice ( 1937) has shown that territorial behavior in the Song Sparrow in the late summer has the function of fixing in the bird an individual territory to which it later returns in the spring. Similarly, Purple Martins may learn the location of available nest sites within a IO-mile radius by post-breeding activity.