This post originally appeared on the BBCEarth blog.
1. Black Caiman
At six meters long, this scaly giant is the largest species in the caiman family and more impressively, the largest predator in the Amazon basin. It has self-replacing teeth along with the most acidic stomach bile in the animal kingdom. This allows them to digest every bit of their prey, including bones, shells and teeth.
Top photo from Joachim S. Muller via flickr
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