as a speculative evolution describe geckos  that highly venemous are either eusocial or parasocial, have ‘hand’ at end of tail, large dewlap, their legs were long and had large amounts of setae, coiled intestines, have tentacles in head, have large visible parietal eye, frilled spine that has large amounts of seta(that isn’t a sail), long snout, have frilled manes,  their own internal heat source, are omnivorous and have  a snake like tongue, that was really long and large, and fangs to spread venom and chew stuff highly aggressive and territorial
