Crocodiles are aggressive predators 11 to 12 feet long. They lie mostly submerged in rivers or marshes, with only their eyes and nostrils showing, waiting for prey to come within reach.

Improved Grab (Ex): To use this ability, a crocodile must hit with its bite attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, the crocodile establishes a hold on the opponent with its mouth and drags it into deep water, attempting to pin it to the bottom.
Hold Breath (Ex): A crocodile can hold its breath for a number of rounds equal to 4 x its Consitution score before it risks drowning.
Skills: A crocodile has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.
*A crocodile gains a +4 racial bonus on Hide checks when in the water. Further, a crocodile can lie in the water with only its eyes and nostrils showing, gaining a +10 cover bonus on Hide checks.
SEE WIKIPEDIA ENTRY: Crocodile

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System Reference Document -> List of Creatures (SRD)