Blup sack

A blup sack was part of an ecorbs' anatomy. It was red-colored and pulsated rhythmically when the owner was happy.Monsters and Aliens from George Lucas
==Behind the scenes==
Blup sacks appeared in a story in Monsters and Aliens from George Lucas, a book published in 1993. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical.
Blup sacks appear similar to real-world gular sacs featured in animals such as the Great Frigatebird.
==Sources==
*Monsters and Aliens from George Lucas 
==Notes and references==
Category:Anatomy