Answer:

dolphin

Answer	Crossword Clue
DOLPHIN	Miami hero of 1973-74
DOLPHIN	Florida footballer
DOLPHIN	Aquarium performer

DOLPHIN	Porpoise.
DOLPHIN	Relative of the porpoise.
DOLPHIN	Relative of the whale.
DOLPHIN	Sea mammal.
DOLPHIN	Brainy mammal.
DOLPHIN	Sea mammal
DOLPHIN	Spiny-finned fish
DOLPHIN	Aquarium star

DOLPHIN	Intelligent sea creature
DOLPHIN	"Bottle-nosed" creature
DOLPHIN	Intelligent swimmer
DOLPHIN	Bottle-nosed creature
DOLPHIN	Flipper for one
DOLPHIN	Dan Marino, notably
DOLPHIN	Sea creature pictured on the flag of Anguilla