Any of several large,heavy-bodied frogs,chiefly of the genus Rana and especially R. catesbeiana,native to North America and having a characteristic deep,resonant croak.

• 牛蛙一种大的，体重的蛙，蛤蟆属，尤指牛蛙原产于北美，有很具特色的低沉的，洪亮的叫声。