(Some of these creatures are very interesting. Liked your Creetle, GlacierDragon ^^)
I've got a few creatures of my own, links to their pics, too. They have their bio on the page, but I do admit, it's hard to read. So I'll put a lil' summary below (some bits may be altered)
Creme de la creme:
http://decepticondeputy-umi.devianta...atomy-64327655
Specie name: Hunter (Kil-zuz-ll)
A reptilian cousin (if you will) of the Ezum; an ancient form of an Ezum from a previous genetic mutation. While most Ezums changed with perfect results, some didn't make it through the spawning pool. Thus, "Hunters" were made.
Ezums, originally carnivores (when their food supplies were running low) began to raise themselves off the sweet, chewy long grass of the Chixapox fields, where now the Ezums thrive. Unfortunately, with the Ezums migration, so followed the carnivorous Hunters. Now, the Hunters prey off of their very close relatives, basically lowering themselves to cannibalism.
Hunters have an array of tools and weapons to better help them on their hunt. Because of their lack in change (to be a true Ezum), Hunters have kept their slender, light bodies. Powerful legs help them accelerate after faster prey, and a retractable claw (much like a velociraptor) helps grapple in to the prey's flesh.
The first, and foremost weapons a Hunter uses is its quadrupedal arms; one set as functional running arms, and a set upon their backs. On its forearms are bird-like fingers; two large frontal appendages, and two thinner, reverse-joint talons. These claws act heavily in catching prey, and helping the Hunter accelerate (and in some cases, decelerate) The appendages attached to their shoulder blades have but 2 claws. One is small, and very flimsy; practically useless. The other, however, proves more useful. A long dagger-like claw latches in to prey, further helping to end a mutilating catch.
One finally, and potentially the greatest of help towards the Hunter, is its jaw-like appendages hidden within its large snout. In these appendages hide a secrete, and potent/deadly venom that has transfigured over the many centuries Hunters have been alive.
Sensory talons that ridge its spine catches motion from over a 5-mile radius. Once a hungry Hunter catches a hint of movement, it won't stop until it dies, or its prey dies. A truly dangerous creature; you wouldn't want to end up in its jowls.
http://decepticondeputy-umi.devianta...atomy-64662699
Specie: Shredder (Guardian of the Swamp) (si-kotic)
An enormous, bipedal monster that is said to have claimed, and guard a swamp over eons since Oddworld first developed. If going through its territory, be warned that you do not fall asleep while it knows your presence is close.
The Shredder doesn't possess vocal chords; therefore, it cannot speak nor make a sound. However, over the years, it has developed a sense of telekinetic powers. It manipulates its power, and reaches in to the minds of sleeping wanderers. It then commences tantalizing, antagonizing, and potentially maddening visions in to the unconscious one, hoping to either drive it to madness, or drive it away from its territory.
The Shredder isn't known to kill anyone or anything, but a sense with its chaotic visions can send one insane, almost to the point of death.
One last feature with this creature; within the spines on its massive tail, a small array of invading tentacles can take control of one's mind processes and vocal abilities. A "puppet" if you will, when it gets a hold of a certain creature that passes its clutches.
http://decepticondeputy-umi.devianta...atomy-64663356
Specie: Knifal (no known specie classification)
The Knifal is a one of a kind creature, as well with the Shredder. Though nowhere near relating to an Ezum or Hunter, it can be quickly mistakened for one with the matching color of its skin. (This is to be thought of a defense mechanism against the Hunters when they are out hunting) The Knifal is also a guardian for its own territory; among the Chixapox fields, where the roaming Ezums feed and thrive. It defends the fields as of its, and the Ezums' personal sanctuary against poachers, and those certainly aggravating Hunters that stalk them.
The speed of this creature is phenomenal. It's no wonder why the Knifal is usually called "the wind of the fields". Its array is its incredibly long, and sharp, knife-like claws it possesses, and its own kind of psychic power.
Sensory talons among its head act much like the Hunters' talons as well.
http://decepticondeputy-umi.devianta...gloki-69944585
Specie: Kigloki
A spliced gene creation of a corporate slug, in hopes to create a monster so grand, it would wipe away the Steef tribe that thrived along his site, so that he may lay his plans down.
The Kigloki is one of its own kind, but a relative of the Glok family (Glukkon, Oktigi, etc.). It is felt that a part of Steef DNA was also spliced in to the Kigloki's embryo during its developing stages, to create its awful tempermental nature, and savage character. The Kigloki is roughly enormous; larger than a fully-grown adult Steef, but smaller than the legendary Sea Rex. It possesses the long, wryly arms of the(unsure of the name *thinking of Sekto's pets*), the octo-like, serpent body of the Oktigi, and squidly-head of a Glukkon.
This creature hasn't been seen in action yet, but with its terrible temper and carnal nature, it is prepared to reign hell among those that stoop in its way.
Lastly...
http://decepticondeputy-umi.devianta...-Geik-87802212
Specie: Geik
An aquatic, reptilian race that lives in sync with the Gabbits (though amazingly, they take Gabbits as a delicacy). The Geik specie is an amazing, and intelligent race. Carnivorous, the Geiks suppress their lust to chew on Gabbit hide, only to keep each other alive to see the next generation. The terrible part of it, though, Gabbits and Geiks must share their source of food; the thriving source of Worryfish.
As generations roll on, Gabbits and Geiks must travel together, through the treacheries of the sea, through the rolling Mongo River, and to the river delta that falls off the Mongo River, to spawn their next generation. Hatchlings will be washed off from the river delta, and right back in to their ancestral ocean.
Geiks are resilient swimmers. Special spinal columns in its tail can be turned, to give the Geiks swimming precision, and swimming speed. Fins facing vertical gives it precision, for moving through thin areas, it doesn't have to worry of dragging its tail. Horizontal gives the Geik acceleration, for escaping possible threats (though they are primarily top of the food chain)
Gills are among its snout instead of its neck. Geiks are not only water-breathers, but can also breath, for a limited time, on land. However, they are rarely seen out of the water.
Your own Oddworld creature?
ongos. 
