Figure 1. A bombardier beetle, an invasive bullfrog, and a native frog.

(A) An adult bombardier beetle Pheropsophus occipitalis jessoensis. (B) A juvenile bullfrog Lithobates catesbeianus. (C) An adult pond frog Pelophylax nigromaculatus. These photographs were taken at the same site and microhabitat on the same date. Photo credit: Shinji Sugiura.