Fig. 1
From: A review of the reproductive system in anuran amphibians
Mating systems and modes in frogs. Amplexus; a male can grasp a female with his front legs by the female’s head, waist, or armpits. This reproductive mode occurs in externally fertilizing species (a). Copulexus; a male clasps the female inguinally rather than axillary to insert its tail. This reproductive mode occurs in internally fertilizing species (b). Monogamy is a mating system where females and males select each other exclusively to couple (c). In contrast, polyandry is when a female mates with two or more different males (d)