Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
Common dolphin
The common dolphin is the name given to two species of dolphin making up the genus Delphinus. Taxonomists and cetologists usually recognise two species — the short-beaked common dolphin, which retains the systematic name "Delphinus delphis", and the long-beaked common dolphin "D. capensis".