several years. Many of our common birds do the same. The birds may be
divided, with respect to this and kindred points, into five general
classes. First, those that repair and appropriate the last year's
nest, as the wren, swallow, blue-bird, great-crested flycatcher, owls,
eagles, fish-hawk, and a few others. Secondly, those that build anew
each season, though frequently rearing more than one brood in the same
nest. Of these, the phœbe-bird is a well-known example. Thirdly, those
that build a new nest for each brood, which includes by far the
greatest number of species. Fourthly, a limited number that make no
nest of their own, but appropriate the abandoned nests of other birds.
Finally, those who use no nest at all, but deposit their eggs in the
sand, which is the case with a large number of aquatic fowls. Thus the
common gull breeds in vast numbers on the sand bars or sand islands
off the south coast of Long Island. A little dent is made in the sand,
the eggs are dropped, and the old birds go their way. In due time the
eggs are hatched by the warmth of the sun, and the little creatures
shift for themselves. In July countless numbers of them, of different
ages and sizes, swarm upon these sandy wastes. As the waves roll out,
they rush down the beach, picking up a kind of sea gluten, and then
hasten back to avoid the next breaker.

[Illustration]




BIRDS IN THEIR RELATION TO AGRICULTURE

(FROM THE PROCEEDINGS OF THE NEBRASKA ORNITHOLOGISTS' UNION JANUARY,
1901.)[4]