The endemic Montserrat galliwasp Diploglossus montisserrati is listed as 'Critically Endangered (CR)' on the IUCN Red List of Threatened Species.  Since its discovery in 1964 there have been only a few confirmed sightings and consequently very little is known about this lizard.  It is highly elusive and lives amongst the leaf litter and rock crevices of just a 1.5ha area of Montserrat's forest.  This makes it one of the world's most geographically restricted vertebrate species, and one of the most endangered lizards.  More information from the IUCN species information page.