The CAPYBARA, COYPU, and paca are all large South American rodents. The CAPYBARA is the largest of the three, weighing up to 140 pounds and measuring up to 4 feet in length. It is a semi-aquatic mammal that lives in and around bodies of water. The COYPU is also semi-aquatic and can weigh up to 20 pounds. It has webbed feet and a round tail. The paca is the smallest of the three, weighing up to 15 pounds and measuring up to 2 feet in length. It is a nocturnal animal that lives in burrows and feeds on fruits, roots, and insects.