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Among the rareties: ivory gull, sharp-tailed sandpiper, lark sparrow and warblers from every corner of the western hemisphere.

The Lark Sparrow is not uncommon in Coahuila.

In studying the birds of the West, one should note that there are western subspecies and varieties, which differ in some respects, though not materially, from their eastern cousins; for instance, the western robin, the western chipping sparrow, the western lark sparrow, and the western nighthawk.

They ceased their concert work, but now and then the lark sparrow pipes up a feeble imitation of his sweet notes in July.

If the big thistle is rooted out, where shall the lark sparrow build her nest?