Movies like Robocroc

An experimental rocket lands near a habitat for a crocodile called "Stella". The payload is an experimental nano technology programmed to survive at all costs. Soon "Stella" encounters the nanotechnology in her food, changing her slowly to the dismay of her keepers. Soon the military show up and take over as man versus Robocroc becomes heated eating it's way through teens at a water park to military men/woman. It soon to find that someone inside the military camp may be helping "Stella" get away for scientific purpose! Will they survive the cunning of man , beast , and technology?