Richard Herrmann / Mojave Rattlesnake (Crotalus scutulatus) with tongue extended, Rainbow Basin natural Area, Mojave Desert, California

Barry Mansell / Mohave Rattlesnake (Crotalus scutulatus) coiled up on sand dunes, Arizona, USA

Barry Mansell / Mohave Rattlesnake (Crotalus scutulatus) coiled under purple flowers, Arizona, USA

Michael D. Kern / Striped mohave rattlesnake (Crotalus scutulatus spp) showing rattle, captive, from USA

Michael D. Kern / Mohave rattlesnake (Crotalus scutulatus) with tongue exposed, captive, from USA and Mexico

Barry Mansell / Mojave Rattlesnake (Crotalus scutulatus) showing tongue and rattle, Arizona, USA

Tony Phelps / Shield-nosed snake {Aspidelaps scutulatus intermedius} Limpopo, South Africa

John Cancalosi / Mojave rattlesnake (Crotalus scutulatus). Arizona, USA

Richard Herrmann / Mojave Rattlesnake (Crotalus scutulatus) showing rattle, Rainbow Basin natural Area, Mojave Desert, California

John Cancalosi / Mojave rattlesnake strike posture {Crotalus scutulatus} Arizona USA

Barry Mansell / Mojave rattlesnake {Crotalus scutulatus} C Arizona USA