There are more than 50 species of warblers in North America, many of them with bright colors and beautiful patterns.  Most rely on insects as their major food source, but one variety, the yellow-rumped, also eats lots of berries.

Susan Evans of Wimberley is the champion spotter that I know of, having recently identified five species at her home, including black-and-white, orange-crowned, Tennessee, golden-cheeked, and northern parula.

The songs of warblers are mostly high pitched, with clear thin...