Scalt

Scalts were creatures believed to have originated from the planet Tatooine who were named after the ear-piercing sound they made. They were egg laying animals which evolved into scavangers on spaceships throughout the Galaxy. When laid out completely, they measured roughly two-and-a-half feet to three feet from the tip of their clubbed tail to their air sacks. They were able to be both bipedal and quadripedal, preferring to walk on two legs. Though they rested during the day, they were extremely high-strung, hyper animals at night.

Behind the scenes
Scalts were created by Mary Burroughs, a Star Wars fan, as part of the Design An Alien contest held in the Star Wars Galaxy Magazines. Though the entry was not picked as a winner, it was given an honorable mention in Star Wars Galaxy 7 and so it is not known exactly how canon the creature is.