Aviiguana

With 2,4-2,7m in lenght Aviiguana one of the smallest species. They lifes in monogamous pairs in the woods and grassland of australia and, insolated, in Neuginea.
The fangs in the dentary are connected with venom-glands that produce a poison that damage flesh.
It's feel like you are burning, not pronounced like the poison of european dragons but strong enough to bring a kangoroo to fall.