Oh jeez, I could natter on for ages about the inspiration behind the creatures and characters of Oddworld, but I'm not going to. Just to give you a little idea of how complex Oddworld are when designing creatures, I'll tell you a bit about Munch (take note, Raymond Swanland
).
Munch, primarily, is a rabbit. Notice his bunny hopping motion and the little bop tail? This of course reflects his test subject nature. However, he is also described by Ed Fries as a fish, although we can look at many aspects of his physical characteristics that come from different marine creatures. Gabbit society is, esentially like that of the dolphins - they swim in pods which are esentially their families, and they are very musical and playful. However, the way in which they are netted and canned is highly suggestive of tuna fish, which are viscious sea fish with a fiesty attitude similar to Munch's. Munch's mouth is a cross between an alligator's (very wide grin with asymmetrical teeth) and a coelocanths's (just the general appearance). Note also that the word Gabbit is a mix between Rabbit and 'Gator.
In addition, Munch's single leg is similar to a seas horse's tail, almost irregular in its design. Munch's flute-like tongue is designed to mimic dolphin noises, but in itself is very frog-like. His torpedo-built head could be mistaken for a shark's dorsal fin when he surfaces, and of course his fins come directly from that of a catfish. Munch is a uniquely designed and highly Oddworldian creature.
Chicken hillbillies are not.