spider-tailed horned viper pseudocerastes urarachnoides tail detail

2006 animal appearance arachnid birds bordered bulblike camelspider camouflaged cryptic dangerous described drooping end endemic fauna horned iran long lure mountains predator pseudocerastes rare reptile scales snake special species spider spidertail spidertailed sunspider tail tip unique urarachnoides venomous viper waved weirdest western wildlife zagros