Portrait of a Guanaco chewing on something, and listen with both ears forward. Guanaco is a mammal of the genus Lam of the family of camelid. Is the ancestor of the domesticated llama. Shutterstock Image - Portrait of a Guanaco chewing on something, and listen with both ears forward. Guanaco is a mammal of the genus Lam of the family of camelid. Is the ancestor of the domesticated llama. - ID: 551319682