The Mexican mole lizard digs intricate tunnels that run below the surface of the soil. To regulate its body temperature, the mole lizard moves to tunnels at different depths — it spends cooler mornings near the surface and as the day heats up, it moves deeper and deeper below ground.

During mating season, male red salamanders are not aggressive towards each other. In fact, they actually court one another — this likely isn't a case of mistaken sex, but an attempt to trick rival males into wasting their sperm packets (spermatophores).

The Devils Hole pupfish is perhaps the rarest fish in the world. It lives in the desert; its entire population is found in one 33.8°C (93°F) pool — mostly on a 3.5 by 5 m (11 by 16 ft) rock shelf — inside a cave in Death Valley, Nevada.