Artillery beast
From Wookieepedia, the Star Wars wiki.
The artillery beast was the main artillery weapon of the Yuuzhan Vong. Used as an anti-aircraft weapon during the Yuuzhan Vong War, this creature was about the size of a Republic SPHA walker. It resembled a large beetle with a gigantic abdomen where the weapon built up plasma to fire a giant globule. The bigger creatures were used as anti-air cannons while the smaller ones were used for mortar fire.
It is unknown what became of the beasts after the war ended; though it can be assumed they were transplanted on Zonama Sekot or loaded onto the warships of the Yuuzhan Vong and sent crashing into Coruscant's primary.
[edit] Behind the scenes
The description of these beasts is similar to the massive plasma bugs seen in the film adaptation of Starship Troopers by Robert Heinlein.
