So far, Castellón’s piranhas have been found in the upper Madeira River in northern Bolivia, a landlocked country bordering Argentina, Brazil, Chile, Paraguay and Peru.

Piranhas had become accustomed to the free food discarded in the river. Once first blood was drawn, the school attacked en masse. When you purchase through links on our site, we may earn an ...

A new species of fish has been discovered in the Amazon: a piranha relative with humanlike teeth. The eye-catcher was named after a “Lord of the Rings” villain.

So far, Castellón’s piranhas have been found in the upper Madeira River in northern Bolivia, a landlocked country bordering Argentina, Brazil, Chile, Paraguay and Peru.