Writer Kate Siber interviewed 50 biologists, researchers, educators, and advocates about the superpowers of animals. Her new ...

But the teeth of giant ground sloths lack enamel, the highly inorganic and hard outer layer on most animal teeth – including our own. Instead, sloth teeth are made primarily of dentin, a more porous ...

Ice Age (as in the movie) tells the heartwarming tale of a mammoth, sloth, and saber-toothed cat that – against the odds – ...