The term Jurassic Park Creature refers to the prehistoric animals featured in the 1993 film Jurassic Park. The two crossword solutions for this term are DINOSAUR (8 letters) and T-Rex (4 letters). A DINOSAUR is a large reptile that lived during the Mesozoic era, which includes the Triassic, Jurassic, and Cretaceous periods. The T-Rex, or Tyrannosaurus Rex, is a species of DINOSAUR that lived during the late Cretaceous period.