How frogs survive the winter cold?

Frog winter.

Natural antifreeze

Humans have fantasized for years about the time when they would be able to deep-freeze someone and restore him to life sometime in the future.

For some frogs, however, this is no fantasy.

They do it every year.

Like other animals, frogs are faced with the problem of surviving winter without central heating or hearth fires.

Their solution?

They “just squat in the open until they freeze solid,” says a report in The Toronto Star.

When spring comes around, the frog thaws out and starts croaking again.

Why doesn’t the freezing kill him?

Biologist Kenneth Storey says:

“We found frogs produce an anti-freeze molecule that we didn’t expect at all: glucose. People had said there was no way to use that as an anti-freeze, but frogs can.”

Seemingly, because of this glucose, when the frog freezes, its tissue fluids turn to syrup instead of forming ice crystals that would expand and rupture its cells.