Fig. 2From: Love bites: male frogs (Plectrohyla, Hylidae) use teeth scratching to deliver sodefrin precursor-like factors to females during amplexusEvidence for traumatic mating in Plectrohyla hartwegi. A Male P. hartwegi with swollen lips. B The male’s spatulate teeth protrude through the lips and are most likely used to scratch the female (C) during amplexus. D shows the potential teeth marks on the back of a female (museum specimen UMMZ 152864)Back to article page