The Burt Bros. start their lives as two normal Burts. During the events of Yoshi's Island DS, the brothers are magically transformed by Kamek into gigantic Burts (although each one is a little smaller than Burt the Bashful). Yellow Yoshi has to beat the Burt Bros. to continue the Yoshi clan's journey to save Baby Luigi and the rest of the babies. Although giant-sized, the Burt Bros. act just like regular Burts. The two hop on top of each other, then jump off, hoping to stomp the Yellow Yoshi. During the battle, the Yoshi attacks the Burt Bros. while they are stacked on top of each other, hurting them both at the same time. After a few Yoshi Egg hits, the Burt Bros. are defeated in the same fashion as Burt the Bashful.