A paraplegic giraffe. Most pararaffe cases have both front limbs missing. They tend to fall over easily. When their back limbs are missing, they are very fast sprinters. There have been no reported cases of pararaffes having one front and one back limb.
Tourist: why does that giraffe keep falling face first in the dirt everytime it gets up?
Safari Guide: No, no, no m'am. That's a pararaffe. It is all explained on page 13 of the guide book.