Birds

Woodland of mixed pines and oaks is familiar mountain scenery in Mexico, whence it extends into southeastern Arizona along with many kinds of Mexican birds. This woodland occupies a belt from about 5500 to 6500 feet in elevation between encinal (oak woodland) below and ponderosa pine forest above. It combines tree forms of both these zones so as to make a smooth transition between them. The present report com- pares the numbers of each species of breeding bird in a series of stations, within pine-oak woodland, which were visited in the summers of 1951, 1952, and 1953.