Abstract
Protaetia brevitarsis (Lewis) (Coleoptera, Scarabaeidae) was detected from Ural Owl’s nests in Japan for the first time. We checked 37 nest boxes and two natural nests of the owl and found many larva in three nest boxes. The beetle larvae was feeding on the plant 72 matters (decaying wood chips, twigs and leaves) and the animal matters (e.g. remnants of food, bird feces and pellets) in the nests.