Warblers are small songbirds which live up to their nickname: most species sing beautifully. Although you often hear them from a distance, they are difficult to see. Warblers hide among the branches, bushes or reed and their plumage is not usually very noticeable. They have a small beak for eating chiefly insects. The family of warblers is sub-divided into the following families: grass warblers, rufous warblers, such as the blackcap, and leaf warblers, such as the goldcrest and the willow warbler.