Behavior
Common bottlenose dolphins live in groups called pods that typically number about 15 individuals, but group size varies from pairs of dolphins to over 100 or even occasionally over 1000 animals for short periods of time. Their diets consist mainly of eels, squid, shrimp and wide variety of fishes. They do not chew their food, instead they swallow it whole. Dolphin groups often work as a team to harvest schools of fish, but they also hunt individually. Dolphins search for prey primarily using echolocation, which is similar to sonar. They emit clicking sounds and listen for the return echos to determine the location and shape of nearby items, including potential prey. Dolphins also use sound for communication, including squeaks and whistles emitted from the blowhole and sounds emitted through body language, such as leaping from the water and slapping their tails on the water. Their heads contain an oily substance that acts as an acoustic lens, as well as protecting the brain case.
Read more about this topic: Common Bottlenose Dolphin
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—Henry David Thoreau (1817–1862)