Snakes swallow their prey whole. They have flexible jaws that allow them to consume animals much larger than their head.
Frogs use their sticky tongues to catch insects and other small prey, which they then swallow whole. They rely on their stomach acids to digest it.
Pelicans scoop up fish along with water. They drain the water from their pouch and then tilt their heads back to swallow the fish whole.
Crocodiles tear off large chunks of their prey and swallow them whole. They have strong stomach acids that help in digesting bones and other tough materials.
Dolphins use their sharp teeth to grasp and hold onto their prey. Instead of chewing, dolphins swallow their prey whole.