Caiman Crocodilus 11. The Lineage Including Alligators Proper (Alligatorinae) Occurs In The Fluvial Deposits Of The Age Of The Upper Chalk In Europe, Where They Did Not Die Out Until The Pliocene Age. The True Alligators Are Today Represented By Two Species, A. Mississippiensis In The Southeastern United States, Which Can Grow To 4.24 M (14 Ft) And Weigh 1000 Lbs (455 Kg)And The Small A. Sinensis In The Yangtze River, People's Republic Of China, Which Grows To An Average Of 1.5 M (5 Ft). Their Name Derives From The Spanish El Lagarto, Which Means The Lizard.

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