Petulia

Petulia was a walrus at the Marineland zoo in California. Ben Burtt used her vocalizations as a basis for Chewbacca's voice, alongside those of the bears Pooh and Tarik.

A blog post by Tim Veekhoven and Mark Newbold on StarWars.com, "Drawing from the Present: Familiar Creatures in a Galaxy Far, Far Away," mentions that Ponda Baba's voice was based on that of a walrus, although they were unsure if he too was voiced by Petulia.

Text and facts from the “Petulia” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.