This is interesting, worth a watch

http://www.abc.net.au/science/broadband/catalyst/ram/tipping_point_hi.ram for REAL player

OR http://www.abc.net.au/science/broadband/catalyst/asx/tipping_point_hi.asx for Windows media player

see the tiny frog, and its even tinier hatchling (they don't hatch as tadpoles, but as frogs)
I visited Heron Is about 10 yrs ago, definitely worth a visit
and the irony of shivering to death due to global warming melting the snow in the Snowy Mountains