Tree frogs supply their own water

Australian tree frogs cool to condense water from humid air

source: New Scientist vol 211 no 2829, September 10 2011 p17

Australian tree frogs emerge from tree hollows at night. This is surprising because it is colder at night, and colder temperatures usually make frogs more sluggish. Chris Tracey and his team from Darwin's Charles Darwin University, Australia, weighed the frogs, and discovered they increased their weight by 0.2 grams after returning to humid air in tree hollows. They had cooled their skin outside, so the moisture in the hollows condensed on the frogs, which could drink 60% of the water.