The Amazon Menace is a term used to describe the dangerous animals that inhabit the Amazon River. These animals include the ANACONDA, a large snake that can grow up to 8 meters in length, the BOA, a smaller snake that can reach 3 meters in length, and the Piranha, a fish that can grow up to 7 centimeters in length and is known for its sharp teeth. All three of these animals are considered to be a menace to humans and other animals in the Amazon River.