In the spring they hatch their eggs in a lonely, quiet cliff on the mountains, locating the nest in a strong tree. No other interloper is tolerated in the same district. Should any such appear, the male Stone Eagle advances with loud, angry shrieks. The intruder pauses, startled for the moment. He does not feel safe in the strange district and hesitates for a moment as to whether to undertake the combat with the rightful owner of the district. Soon, however, his boldness overweighs his better judgment and the powerful Birds circle about each other seeking to attack a weak spot. They circle nearer and presently with a bold plunge one swoops down upon his opponent. Each clutches the other with powerful fangs, making the blood flow and amid the rushing noise of the flapping wings, furious blows are struck, causing the feathers to fly in every direction. The combatants gradually sink lower and soon touch the earth upon which they roll about. Presently the intruder endeavors to free himself and, bleeding from many wounds, hastens away. The victor pursues him for a short distance and finally returns to his mate, who, having been an interested witness of the combat from the distance, welcomes him with joyful clamor. The Stone Eagle lays from two to four eggs, about the size of a Peacock’s, of a greenish white color with brown spots. During the time their young remain in the nest the parents’ search for prey is continuous. In one of the nests, Hunter Regg found part of a Fox, a Prairie Dog and remains of not less than five Rabbits of the Alps. THE SEA EAGLE. [Illustration: Falcons Fighting.]