is a young glyptodont shown in Ice Age: The Meltdown at Sid's camp joining James in picking on Sid, pulling on a vine with his mouth to hold Sid up and use him as a piñata. As Sid told his friends that the young animals at the camp were fond of him, he asked Billy if he agreed, but Billy just mocked him by saying "Don't make me eat you." Billy was also shown during the migration, panicking among other animals when they realized the dam had burst.

Billy is voiced by Caitlin Rose Anderson, who also voiced Ashley.

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