The chapter The Beach is basically about Guiterrez taking matters into his own hands and going to the beach in Cabo Blanco to retrieve the unidentified lizard, mainly to test it for disease.
Despite his diagnosis to the Bowmans, Guiterrez was certain that the lizard that bit the American child was a new breed of lizard. To test the lizard for toxins, Guiterrez went to the same beach that the Bowmans had been on. His day was unsuccessful, when he spotted a howler monkey eating a green lizard. Guiterrez sedated the monkey, retrieved the sample, and forwarded it to the office of Edward H. Simpson.