Here are the main bird beak, or bill, types:
Short, slender beaks adapted for probing into tight places such as bark fissures on tree trunks where small insects, spiders, and other creatures might be wedged; found among warblers, vireos, kinglets, gnatcatchers, and others such as the Tufted Titmouse shown at the left..
Short, stubby, but powerful beaks adapted for grinding small seeds, found among sparrows, finches, juncos, and others, such as the Evening Grosbeak shown at the right.
Fairly long, thick, chisel-like beaks of woodpecker adapted for drilling wood and chipping away tree bark and even for drilling into the tree's inner bark, as shown on the Yellow-bellied Sapsucker shown at the left
Plus, there are all kinds of specialized beaks such as the one shown on the White Pelican at the right. The pelican will crash into the water and come up with a fish in its beak. It may flip the fish in the air and catch in again, with a more secure hold, and then swallow it. As the fish goes down you might see that the beak's bottom part is somewhat baggy. It's sort of like a leather bag that can expand if there's a big fish in it. You've seen in cartoons how pelicans have incredibly big pouches in which they can place their suitcases. In real life the pouches aren't as big, but they certainly can expand to hold a big fish