… That piranhas bark? From anecdotes and observational research, scientists have known for a while that red-bellied piranhas make bark-like noises when caught by fishermen. Upon further examination, a team of Belgian scientists found that they make three distinctive types of vocalization in different situations.
… That the Amazon basin is home for over 2’500 species of fish, more species that are recorded for the entire Atlantic Ocean, and some experts estimate that there may be as many as 6’000 species.
These range from giant 3 meter air-breathing fish (Arapaima Gigas) and river catfish weighing up to 600 – 700 pounds to tiny tetras, electric eels, stingrays to flying fish. New species are discovered yearly, even in the “better known” areas.
(Source: Ocean Defender – Hawaii)