There are documentaries on the fish, some are quite fascinating. Some will eat sloths during the rainy season, when the rainy season comes and the sloths have to move to find new food.
Serrasalmus contains approximately 22 piranha species. Unlike other piranha, Serrasalmus species are not schooling fish, but typically hunt alone and exist in solitude. The maculatus, commonly called the ruby-red piranha, is one of the most widespread Serrasalmus species, inhabiting the waters of Argentina, Brazil, Guyana, Surinam and Venezuela.
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A strong bite runs in the family. The idea that a piranha could rip a human to shreds is probably more legend than fact, too. For the curious, Popular Science spoke to some experts who estimate that stripping the flesh from a 180-pound human in 5 minutes would require approximately 300 to 500 piranhas.
Notorious for their aggressive nature, piranhas generally avoid larger fish and animals unless starving or provoked into a feeding frenzy. The red-bellied piranha is the best known, but there are several species of piranha and their relatives that range from 1 foot to over 3 feet long.
Top 6 Piranha Facts. There are around 30 species in known existence, with average sizes ranging from 5 to 10 inches in length – though in rare cases they can extend up to 24 inches. They are a diverse animal, with different types displaying a range of colours and patterning, from yellow to black, steely grey to dark red, often with colourful underbellies.