animal bearded claws dragon ear exotic eye head legs lizard mouth nose nostril pogona reptile scales spines thorns tropical gs le long tail appearance Australia-wide Australian bearded dragon lizard bearded dragons chameleon-like cold blooded defensive docile fauna gentle gray grey hardy lizards native pair pet protected rough scary skin spiky surface survivor texture wild arid-suroounds bearded-dragon brown colour-change defensive-posture flighty grass-tree-stump medium-sized pet-lizard placid pogona-vitticeps reptilian resting spikes still wary bearded-dragon-lizard Camouflage cold-blooded color-changes coloration colors colour-changes colours green night-lighting