Skeleton Birds (スケルトンバード, Sukeruton Bādo) are enemies in the game Happy Tree Friends Origins. They debuted in the level Ghost Cave. As their name implies, these creatures are flying skeletal birds. Skeleton Birds wear a green hood, a red bandana and have two wings. They attack by spitting white goo balls, which can hurt Lemy and Allay. After hitting it enough times, it will revert into a Dry Bones.