Hellbender
The hellbender breathes mostly through its skin, and its baggy, wrinkly folds increase the surface area for absorbing oxygen from the water.
Amphibian
Olm
The olm can live for about a century, and scientists recorded one that did not move from the same spot for over seven years.
Red-eyed Tree Frog
Red-eyed tree frog embryos can hatch early, within seconds, if they sense the vibrations of a snake attacking their egg clutch.
Wood Frog
The wood frog freezes solid in winter: its heart stops and up to about two-thirds of its body water turns to ice, yet it thaws and hops away in spring.