Polygyny with mate fidelity in the saxicolous frog

While polygyny is common among vertebrates, polygyny with mate fidelity has not yet been demonstrated in amphibians. A recent study by Fábio de Sá and colleagues shows that single male saxicolous frogs share a breeding territory with two females and mate multiple times with them over the course of a breeding season. These authors attribute the evolution of this mating system to the intense competition for territories and mates when access to these resources is scarce.