A venomous beaded lizard native to the south-western US and Mexico.
Heloderma suspectum, family Helodermatidae.
Moreover, like many snakes - but unlike any other lizards - Gila monsters and beaded lizards are venomous....
At rest, Gila monsters and beaded lizards have among the lowest metabolic rates ever measured in lizards - far lower than the rates in monitor lizards.
The only poisonous lizards are the Gila monster and the beaded lizard, both of which live in the desserts of Mexico and Arizona.
Origin
Late 19th century: named after Gila, a river in New Mexico and Arizona.