WAmeiva ameiva
WAmphisbaena alba
WAmphisbaena mertensii
WApostolepis assimilis
WArgentine black and white tegu
WArgentine snake-necked turtle
WArgentinian coral snake
WBoa constrictor occidentalis
WBorelli's marked gecko
WBothrops alternatus
WBothrops jararaca
WBothrops jararacussu
WBroad-snouted caiman
WCuvier's dwarf caiman
WYacare caiman
WChaco tortoise
WCope's mabuya
WCopeoglossum nigropunctatum
WCrotalus durissus
WErythrolamprus aesculapii
WGreen anaconda
WHelicops infrataeniatus
WHelicops leopardinus
WHomonota horrida
WHydrodynastes gigas
WImantodes cenchoa
WMesoclemmys gibba
WMicrurus altirostris
WMicrurus baliocoryphus
WMicrurus corallinus
WMicrurus frontalis
WMicrurus lemniscatus
WOxyrhopus guibei
WOxyrhopus petolarius
WPalusophis bifossatus
WPhilodryas aestiva
WPhilodryas baroni
WPhilodryas olfersii
WPhrynops geoffroanus
WPhrynops hilarii
WPolychrus acutirostris
WRed tegu
WRhinobothryum lentiginosum
WTaeniophallus occipitalis
WTantilla melanocephala
WThamnodynastes hypoconia
WThamnodynastes pallidus
WBig-headed pantanal swamp turtle
WVanderhaege's toad-headed turtle
WXenodon merremii
WYellow anaconda