"If you understand the distribution of these structures in the skin of a prey animal, you can understand something about predator-prey interactions, and it might explain some of the hadrosaur fossils we see with these bite marks, " he said.

BBC: Dinosaur mummy yields its secrets

Even if a Kindle Fire owner never uses the device to buy something from Amazon.com, the e-commerce giant could still take a bite out of Wal-Mart with its new device.

FORBES: Why Wal-Mart Dropped Amazon's Kindle