Video to BEH 3689

A male anuran aligns his cloaca near a female’s cloaca during mating in species with axillary amplexus, like the wood frog, and a substantial size disparity could misalign cloacae and impede the distribution of sperm over the clutch, thus reducing fertilization rates. In addition, male wood frogs use their hind legs to 'pull' the eggs from a female’s cloaca, and the male pushes the emerging clutch against the female’s hind legs to shape it into a ball.