If fan made content gets it please include Rybirs... I guess you should ask Marvak/Sparky first... but they are my favorite fan made Oddworld creature.

Weighing 6 tonnes and standing 7 feet tall, the Rybir may seem like the ultimate killing machine. Was once used by Slig Security Forces as a beast of war, but the Rybir's lethargic behaviour and (for the most part) disinterest in killing made it very inconvenient. Furthermore, when breeding season came around, females on heat proved to be utterly uncontrollable, even by teams of Big Bros.
The Rybir can go for almost two weeks without the need to eat, their primary source of food being the larger animals such as Scrabs, Paramites and Meetles. Mudokons and Elums prove to be too quick to catch.
The Rybir kills it's prey by lying in wait, often for days, in long grass untill an unsuspecting creature wanders by. The Rybir then makes a sudden leap, pinning the prey against the ground and crushing it to death, before tearing at it's flesh and bones with it's beak.
The Rybir has four eyes; two facing forward, for enhanced binocular vision, to hunt prey. And two at the sides of its head, to watch for potential predators. You'd think that such a large and dangerous beast would have no predators, but the Rybir's skin is on of the toughest and softest of all mammals, with the weakness being the soft underbelly. Brave Mudokons who wish to prove themselves may set out on a quest to bring back the hide of a Rybir as a trophy