I am doing my Biome report on an animal known as an piranha. Piranhas are very interesting animals and I am going to tell you about what I have learned about the animal that lives in the amazon river. The Piranha is the Amazon Rivers most famous resident. Piranhas are an meat eating fish with razor sharp teeth that are capable or tearing through and or into fish. In certain seasons The Amazon Rivers banks may over flow causing many injured animals that may be bleeding to fall in to the river. If they are bleeding the piranhas can smell it, and then them swarm around in devouring it within minutes, only leaving the skeleton behind. (web) Piranhas are most dangerous during daylight because they can better see their prey before attacking it.
During the night piranhas rest very quietly around rocks, plants, and many other protected areas. (web) Piranhas often travel in small loosely organized groups. Whether they are living in small or large groups they seem very suspicious of each other. If a Piranha violates another Piranhas surroundings they threaten them or they use aggression. They also approach them from the rear because they become very disturbed, when approached from behind. Piranhas usually leave larger animals than them alone, but during certain seasons they attack more often.
When the weather is very dry the lakes and or rivers they live in begin to dry up. This means they have less food and less room, so they scramble to eat everything in sight, even other Piranhas. Piranhas have many hunting methods such as, ambush, approaching under guise, active chases, stalking, and aggressive mimicry. I am going to tell you about active chases and approaching under guise, because yo may not know what they are. Active chases is when small groups of piranhas attack small schools of fish, causing them to scatter. then they all find a single specimen to hunt.
They usually attack the fish by the tail, no matter what method is being used. The other hunting method is approaching under guise. During this method they attempt to get in the fishes view without showing any interest in them. They go closer and closer without letting the fish feel harmed, and at the last minute they sweep over to their prey and chew off a piece of the fin. (web) That is the information I found out about Piranhas. Piranhas are a weird and scary species, but I enjoyed doing a report on them. Thank you for listening to what I have had to say about Piranhas.