This is bird note.

Two wrens are singing in a canyon in the arid Sonoran desert.

A cactus wren sings from dense stands of Choyah Cactus at the base of the canyon wall.

At the same time, a canyon wren sings from the open face of the towering stone wall above.

The songs intermingle.

The two wrens share common ancestry and their close neighbors in the canyons.

Yet their songs evolved along divergent acoustic lines,

because a bird's song must carry well in its immediate habitat.

The rough-trilled phrases of the cactus wren song pulse through the dense cactus.

While the clear tones of the canyon wren echo off the hard stone, carrying a long distance.

With cactus and canyon wrens, there's a clear sense of how the different habitats, cactus and stone, live in their songs.

For Bird Note, I'm Michael Stein.

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