The species of the genus Paedophryne are all extremely small and live at the bottom of the forest between fallen leaves and moss, reports Kraus. Presumably, their small size is an adaptation to this habitat. The advantage is that they can access food resources in the leaf litter that their big relatives and food competitors can not access.
In addition to the size of the little things has another curious feature: They have only three functioning fingers on the front legs. Kraus suspects that the number of fingers has been reduced, while the animals have become smaller and smaller in the course of their evolution.
The frog females of the two new species apparently always lay only one or two eggs, reports Kraus. For comparison: The females of the European tree frog lay 200 to 1400 eggs. The small number of eggs is probably related to the mini-growth: The frogs may not be even smaller, otherwise they would not be able to carry enough oocytes in the body. The mini-amphibians are therefore probably at the lower limit arrived. displayFred Kraus (Bishop Museum, Honolulu): Zoo Keys, doi: 10.3897 / zookeys.48.446 © wissenschaft.de - Maria Georgi