Mostly found on land, the adult Challhuaco frog is well camouflaged amongst the fallen leaves and branches that carpet the floor of its forest habitat. Breeding takes place in spring (mid to late October), with the females spawning in Laguna Verde, and also, during particularly rainy years, in temporary water bodies formed after the snowmelt. After hatching, the tadpoles swim to the shallow water around the shore of the lake. Here they grow from just under a centimetre to over seven centimetres in length, and begin to explore the lake. The tadpoles feed on microscopic animals and algae suspended in the water on the lakebed. In Laguna Verde, the tadpoles metamorphose either at the end of summer (December), or remain as tadpoles throughout the winter, metamorphosing in the following summer. This means that the offspring from a single spawn can contribute to the Challhuaco frog population two years in a row, a useful survival strategy if the conditions in one year are particularly adverse. For those tadpoles found in temporary water bodies, deferring development is not possible, as they must metamorphose quickly, before their habitat dries up at the end of summer. In the period following metamorphosis, the juvenile frogs remain near the lake’s shore, but as they mature they move into the forest (2).