Piranhas and their herbivorous cousins pacus have distinctive teeth used to tear through tough food. A recent paper by Matthew Kolmann, a postdoctoral fellow in the Columbian College of Arts and Sciences Department of Biological Sciences, suggests that how these fish lose their teeth—all at once on one side of their head—be considered a characteristic of the piranha’s family, Serrasalmidae.
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Source: Phys.org