Mexican beaded lizard debate among scientists. However, this venom has been found to contain several enzymes useful for manufacturing drugs in the treatment of diabetes, and research on the pharmacological use of its venom is ongoing. Threatened throughout its range by overcollection and habitat loss, it is a CITES protected species. The Guatemalan beaded lizard ("H. charlesbogerti" ) is one of the rarest lizards in the world, with a wild population of fewer than 200. The beaded lizards have one close living relative, the Gila monster ("H. suspectum"), as well as many extinct relatives in the Helodermatidae, whose genetic history may be traced
Dunn's spinytail lizard it excavates itself, especially under fallen logs. "M. groi" is oviparous. Dunn's spinytail lizard Morunasaurus groi, known commonly as Gro's manticore, Dunn's spinytail iguana, or Dunn's spinytail lizard, is a species of lizard in the family Hoplocercidae. The species is endemic to northwestern South America and Panama. The specific name, "groi", commemorates "Lord Gro", a character in the novel "The Worm Ouroboros" by Eric Rücker Eddison. The tail of "M. groi" is covered with small spines. Males are reddish-brown with dark brown transverse bands across the back, reaching to the middle of the sides and then breaking up into small,