Dolphins, like you and me, are mammals.
Dolphins belong to a group of mammals called cetaceans .
Cetaceans include all whales and dolphins. Some cetaceans, like the blue whale, are baleen whales and have horny plates hanging from their upper jaw that are used to strain food from the ocean. The dolphins that we are studying in the Indian River Lagoon are bottlenose dolphins and they belong in the subgroup of oceanic dolphins. Even though they are both toothed whales, they have different body shapes. Dolphins usually have a large forehead.