Many birds rely on insects as their primary food source, so their beaks complement their bug-hunting styles. Warblers, gnatcatchers and wrens have slender, tweezerlike bills fit for plucking ...

“normal” beaks (examples shown of a petrel and a gull) and a bird with a tactile bill-tip organ (a tinamou, close relative of ostriches and emus and which has an ancestral bill-tip organ ...