Mexican beaded lizard (Heloderma
horridum) - The beaded lizard of Mexico is the
larger of the two species of venomous lizards. These
lizards have large grooved teeth in the lower jaw
and when threatened they lash out and grip the attacker
like a vise, pumping venom into it. Their large
tails are used to store fat, which helps them through
periods of low food availability.