How do piranhas sense their prey?

All the fish species I am aware of, have a lateral line, a row of tiny pits along the side of the animal, which contain little hair like structures and function a bit like ears, and can detect the vibration of struggling prey animals in the water, or their main food, fruit, with pin point accuracy, taste and vision do the rest. read more

They have a very acute sense of smell. In their natural habitat, the murky rivers in South-America even more darkened by overhanging vegetation; scent is their main way of tracking down their prey. Teeth The piranha's unmistakable trademark features are the triangular, razor sharp teeth; large ones in the lower jaw and smaller ones in the upper jaw. read more

3. Piranhas found outside South America are usually pets on the lam. Piranhas attract a certain type of pet lover, and sometimes when the fish gets too large for its aquarium said pet lover decides its much better off in the local lake. In this manner, piranhas have shown up in waterways around the globe from Great Britain to China to Texas. read more