From the AWeb site:
"A tiny new frog (the Old World's smallest) has been discovered living and breeding inside pitcher plants on Borneo. Das and Haas (2010) describe the new species, Microhyla nepenthicola, in the journal Zootaxa. Adult male frogs measure between 10.6 and 12.8 mm in snout-vent length (SVL); new metamorphs measure just 3.5 mm on average (one-third the diameter of a pea). Although pitcher plants are carnivorous and consume insects that fall in, Microhyla nepenthicola tadpoles suffer no ill effects from developing inside the pitcher's digestive liquid.