Creep

Creeps are lizard-like creatures of Grimm. They are first encountered at the end of Volume 2, in both "No Brakes" and "Breach."

Appearance
In terms of appearance, these Grimm are akin to certain species of theropod dinosaurs. However, this Grimm shows one unique feature: it has no forelimbs, only hindlimbs. Said hindlimbs are dual-clawed, and are inverted at the knee joints, heavily akin to an ostrich. They also possess tails, which are used for balance during locomotion.

Their skulls are rather stubby, and are very similar in appearance to a Carnotaurus. Like all other Grimm, they feature a dark black color, with white markings all over the body, alongside deep red eyes.

No Brakes
Several Creeps are seen alongside the various other species of Grimm that have made their way into Mountain Glenn's subway systems, following the White Fang's detonation of cargo train cars inside.

Breach
Creeps are seen rampaging through Vale, accompanied by their various brethren. Team RWBY ends up killing the invading Creeps with the assistance of Team JNPR, the Atlesian military, Emerald Sustrai,Bartholomew Oobleck, Peter Port, and Glynda Goodwitch.

Abilities and Powers
Due to the Creep's limited combat appearances, it's unknown as to what specific abilities, if any at all, these Grimm possess. They are shown to be very fast in their movements however, and can chase a speeding train with ease.

Trivia

 * Creeps are the first Grimm that do not appear to be based on any one type of animal. Instead, their design is inspired by aspects of both reptiles and birds as classes.