10 BIRDS OF CALIFORNIA AFFECTING FRUIT INDUSTRY. 
migration. On the other hand, fruit grown near or in brushy can- 
yons or on wooded hills is taken by birds that live in such places; or 
a stream flowing through a region of orchards may harbor in the 
shrubbery on its banks many birds that do not live in the orchard 
itself. 5 
Hence depredations by birds may arise: (1) From the settlement 
of a region and consequent introduction of new crops, accom- 
panied by a diminished supply of natural food, destruction of ene- 
mies, and a general change of natural conditions; (2) from failure 
of the normal food supply, causing migration in search of food, or 
an attack upon some product which the species does not usually eat; 
(3) from proximity to a particular crop, in which case the bird natu- 
vally eats that which is most available. 
CONDITIONS IN CALIFORNIA COMPARED WITH THOSE IN THE EASTERN 
STATES. 
Before proceeding to a consideration of particular birds, one point 
should be specially noted in connection with the subject of the rela- 
tion of birds to fruit in California. Those parts of the State where 
fruit is grown are not so well supplied with wild fruits on which 
birds feed as are the fruit-growing areas of the Eastern States, or 
even of those farther north on the Pacific coast. While California 
has an abundance of wild berries which serve as food for birds, they 
do not commonly grow near orchards and vineyards. 
In the Eastern States a plentiful supply of fruit, as acceptable to 
birds as the best products of the orchard or garden (perhaps more 
acceptable), is usually present in pastures and along roadsides, so 
that it is only where wild fruits are exterminated by cultivation that 
birds are forced to eat cultivated kinds. So abundant is wild fruit 
in some regions, as in the United States east of the Alleghanies, that 
it is safe to say that thousands of bushels of blackberries and rasp- 
berries which grow wild everywhere annually fall to the ground and 
rot, in spite of the fact that great quantities are gathered and eaten 
by man as well as by birds. The same is true of blueberries (Vac- 
cinium) and huckleberries (Gaylussacia), which are so abundant in 
a wild state that in their season they appear in the markets of most 
of the cities and large towns, and are eaten in every country home in 
the region where they grow. In addition to these are several species 
of dogwood (Cornus), holly (Ilex), cherry (Prunus), Viburnum, 
and inany others, all of which are freely eaten by birds. 
Although many of these fruit-bearing shrubs are represented in 
California by related species, they usually grow in the mountains 
remote from fruit-growing districts. In fact, the elderberry (Sam- 
bueus), the introduced pepperberry (Schiiniws molle), and an occa- 
sional mistletoe berry are the only important uncultivated fruits 
