Toes pointed, legs long and slender. Male darker, female bigger. Feeds on insects. In spring, the female lays black and white eggs, in spherical underwater clusters coated in jelly. The pink and bronze tadpoles hatch in 4 to 24 days, developing into adults in four years.
Ice crystals form beneath the skin and become interspersed among the body's skeletal muscles.
During the freeze, the frog's breathing, blood flow, and heartbeat cease. Freezing is made possible by specialized proteins and glucose, which prevent intracellular freezing and dehydration. Wood frogs are masters of camouflage - they can change from dark to light to match with their surroundings within an hour. The photos show frogs matching their different backgrounds.