Do you see the black spot that looks for that person's eye? Well, this is nothing more and nothing less than a leech, the leech T. REX. It is huge (for what it is) from 5 to 6 inches long and has a row of sharp teeth that cling to the meat of the mucosa and do not release ... subject once suck suck and suck and are terrible. The bite is painless, because saliva contains an anesthetic. It also has an anticoagulant that ensures the flow of blood as it is suctioned.
Makes relatively little is known, in fact, was discovered in the nostrils of a Peruvian girl who went to the doctor because I felt that something was slipped inside the nostrils. And one thing is for sure, a lot of strength must have to enter through the nostrils of a person.
Anyway, if you want to dabble in the desirable South American rivers, have one thing in mind: an enemy awaits you. Hehehe