Dolphins are a member of the cetacean family; they are considered one of the smartest mammals, with a high capacity for learning.
Appearances in games
A dolphin is the main character in the Ecco the Dolphin series.
Though never seen on screen, the USS Enterprise D had a number of dolphins on board. According to The Next Generation Technical Guide, dolphins helped to provide navigational assistance to the crew.
Dolphins feature as a unit in Red Alert 2; Red Alert 3 features dolphin skeletons.