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Proboscis monkeys are some of the largest monkeys in Asia. Males can weigh up to 50 pounds (22 kg) and measure between 29 and 30 inches (73–76 cm), head to belly. Mature males have a large pendulous nose that hangs down over their mouth and also have a bright red and always erect penis. From what I can read there is no definite answer as to why they are always erect but many agree that it is probably a secondary sexual selection attribute (after the nose). Their local nick name is “red rockets” and it’s easy to understand why.