Beak morphology refers to the shape and structure of a bird's beak, which varies widely among species. This variation is often adapted to the bird's feeding habits and environment. For example, birds like hummingbirds have long, slender beaks for reaching nectar, while sparrows possess short, strong beaks for cracking seeds. The study of beak morphology can provide insights into evolutionary processes and ecological niches. Changes in beak shape can indicate how birds adapt to different food sources or habitats. Researchers often examine these adaptations to understand the relationship between birds and their environments better.