DENDROLOGY

Detailed explanation-1: -Although dolphins swim in water and appear to be “fish-like” compared to other animals living in the ocean, they are classified as cetaceans (marine mammals) and not fish.

Detailed explanation-2: -Yes, dolphins are vertebrates, as are all Cetaceans. The largest species of dolphin is the orca, whose scientific name is Orcinus orca. All dolphin species have large brains, and they are among the most intelligent of all mammals.