Pacu is a common freshwater fish of Brazilian rivers. Are found in the Pantanal and Amazon a basin in general. It feeds on fruits, crabs and organic debris found in water. They are popularly thought of as herbivorous. Their teeth, which may look similar to human teeth, are used to cut through vegetation and crush seeds that fall into the water. Pacu and piranha have similar teeth, although the difference is jaw alignments; piranha have pointed, razor-sharp teeth in a pronounced underbite, whereas pacu have squarer, straighter teeth in a less severe underbite, or a slight overbite. Additionally, full-grown Pacu are much larger than piranha, reaching up to 30 kg (60 pounds) in weight, in the wild. Theodore Roosevelt wrote of catching and eating pacu in his book Through the Brazilian Wilderness. He described them as “good-sized, deep-bodied fish,” and noted, “They were delicious eating.”