I've never heard of a Capybara, so I looked her up! Adult capybaras may be as long as 130 centimeters (more than four feet) and 50 centimeters (1.6 feet) tall, and weigh more than 45 kg (100 pounds).... They are the word's largest rodents. They are grazing herbivores, eating mainly grasses and aquatic plants. Capybaras are proficient swimmers, swimming with only their nostrils, eyes, and ears above the surface. They are also known to swim underwater - sometimes for considerable distances....They are social animals, living in groups of 6-20 and occasionally congregating in aggregates as large as 100 individuals. Social groups are controlled by a dominant male whose social status is vigorously and aggressively maintained.

Compare with the Squirrel Monkey... Squirrel monkeys grow to 25 to 35 cm (10-14 inches) (plus a 35 to 42 cm tail). They weigh 750 to 1100g (1.5-2.5 lbs). Squirrel monkeys are omnivores, eating primarily fruits and insects. Occasionally they also eat nuts, buds, eggs and small vertebrates. The Squirrel monkeys' social relationships are very complex. They live in large groups, subdivided into adult male bands, mother-and-infant bands, and juveniles, except during the mating season. Females often form a special bond with another female. The size of the groups can vary from 20 - 35 up to as many as 200 or more in some areas. They all sleep together at night, then divide up to go and look for food. In the mating season the mature males become very active, put on a lot of weight and seek the company of females.

And a bonus fun fact: Female squirrel monkeys have a pseudo-penis that they use to display dominance over smaller monkeys, much like the way the male squirrel monkeys display their dominance.

There, that'll help you decide...

Personally, I agree they *are* an odd couple, but hey, I've seen odder! As for me, I'm a monkey.