250 THE PEREGRINE FALCON. 
surface of the water. The Falcon has been seen to drive a dunlin re- 
peatedly into the sea before it could intercept the poor bird between the ° 
dry land and its watery refuge. It will also strike at the grey crows, or at 
herons, but unless specially trained to the pursuit, will not trouble itself 
further about them. 
PEREGRINE FALCON. (Falco peregrinus.) 
The full speed of the Peregrine Falcon has been computed at a hundred 
and fifty miles per hour, and a single chase will often occupy a space of 
eight or ten miles. Its power of wing is not only useful in enabling it to 
swage successful pursuit of swift-winged birds, but in giving it sufficient 
buoyancy to carry off the prey which it has secured. So strong is the 
