But the hawks themselves were more interesting than their unbidden guests. Ismaques, honest fellow that he is, mates for life, and comes back to the same nest year after year. The only exception to this rule that I know is in the case of a fishhawk, whom I knew well as a boy, and who lost his mate one summer by an accident. The accident came from a gun in the hands of an unthinking sportsman. The grief of Ismaques was evident, even to the unthinking. One could hear it in the lonely, questioning cry that he sent out over the still summer woods; and see it in the sweep of his wings as he went far afield to other ponds, not to fish, for Ismaques never fishes on his neighbor's preserves, but to search for his lost mate. For weeks he lingered in the old haunts, calling and searching everywhere; but at last the loneliness and the memories were too much for him. He left the place long before the time of migration had come; and the next spring a strange couple came to the spot, repaired the old nest, and went fishing in the pond. Ordinarily the birds respect each other's fishing grounds, and especially the old nests; but this pair came and took possession without hesitation, as if they had some understanding with the former owner, who never came back again.
The old spruce on the mountain side had been occupied many years by my fishing friends. As is usually the case, it had given up its life to its bird masters. The oil from their frequent feastings had soaked into the bark, following down and down, checking the sap's rising, till at last it grew discouraged and ceased to climb. Then the tree died and gave up its branches, one by one, to repair the nest above. The jagged, broken ends showed everywhere how they had been broken off to supply the hawks' necessities.
There is a curious bit of building lore suggested by these broken branches, that one may learn for himself any springtime by watching the birds at their nest building. Large sticks are required for a foundation. The ground is strewed with such; but Ismaques never comes down to the ground if he can avoid it. Even when he drops an unusually heavy fish, in his flight above the trees, he looks after it regretfully, but never follows. He may be hungry, but he will not set his huge hooked talons on the earth. He cannot walk, and loses all his power there. So he goes off and fishes patiently, hours long, to replace his lost catch.