A nifty fact about wood frogs: they are tolerant of being frozen:
“As the temperature drops below freezing each winter, the wood frog drifts into a deep hibernation, its breathing and heartbeat grind to a halt, and as much as 65% of the water in its body gradually crystallizes into ice.”
If you click around on that site, you can find additional nifty info, like MRI images of a frog actually in the process of freezing solid.
I guess we know what the males are cussing about now!
[Photo from gwarcita]