The Predator

The Predator is a large carnivorous swamp monster who frequently appeared on Dinosaurs. The creature first appeared in the second season episode "I Never Ate for My Father" where it was referred to as a swamp monster and consumed Earl and Robbie. The swamp monster is a hand puppet, matted to look like a giant creature. Every swamp monster seen on Dinosaurs looks identical. It takes a few days for the monster to digest his meals.

In its second appearance, in "Slave to Fashion," the puppet was used as the title character for the TV series Totally Hidden Predator. This was the first reference to it as "The Predator," and no other official name is known. The monster would continue to be seen both on television and encountering the Sinclairs in the wild.

Physical appearance
The Predator, or simply swamp monster, is large and dark green, with two long, clawed forelimbs, and with a very large crocodilian head. The creature's mouth is large enough to swallow dinosaurs whole and brims with sharp teeth, and two long horns jut from the skull like those of a bull.

The Predator inhabits swamps and is an indiscriminate eater, swallowing whatever creatures it can. It takes a few  days to digest its food, giving those swallowed time to reflect upon their situation. The creature gets its name, at least outside the series, from its appearance as the title character in the show-within-a-show Totally Hidden Predator. It is not known to have any other official name.==Trivia==
 * The swamp monster is a hand puppet, matted into the scene to look like a giant creature. Every swamp monster seen on Dinosaurs looks identical, and given the fact that many of the puppets on Dinosaurs were regularly reused as different characters, and only one swamp monster at a time is seen, it is unclear whether all swamp monsters look the same, or if all appearances by a swamp monster are actually appearances by the same swamp monster.
 * This puppet originally appeared in The Jim Henson Hour episode Monster Maker.
 * A photo caption in Matt Bacon's book about Jim Henson's Creature Shop, No Strings Attached, describes this puppet as a demon.