Wood Frog

• fisiologíaIt can survive being almost wholly frozen through the winter: as much as 65% of the water in its body turns to ice and its heart stops for a time.
• It freezes solid: up to two thirds of the water in its body turns to ice, its heart stops completely and it stops breathing for weeks or months. In spring it thaws from the inside out and within a few hours it is hopping about again.
• The trick is glucose: on detecting the first ice crystal on its skin, the liver floods the cells with glucose at concentrations that would be fatal in a human, and that antifreeze stops ice forming inside the cells and destroying them.
• Its physiology is being studied to improve the preservation of organs for transplant, one of the great bottlenecks of medicine today.

Skeleton type

Vertebrate - internal bony skeleton (amphibian)

Habitat and environment

Damp woodland, tundra and peat bogs of North America, as far north as northern Alaska

Sexual maturity

2.5 years

Gestation / incubation

Larval development in temporary pools

Litter / clutch size

900

Sources consulted: https://es.wikipedia.org/wiki/Lithobates_sylvaticus

The pins mark the parks where its presence is documented.