As It Happens7:10Not only are Komodo dragon teeth razor sharp; they're also iron coated Not only do Komodo dragons have serrated, razor-sharp teeth that constantly replenish themselves — they're ...

With its chisel-like teeth, a beaver can fell a tree in a matter of hours. The animals eat the bark and use the wood to build lodges and dams. Photograph by RONAN DONOVAN. By Ben Goldfarb.

Farther down, he picked up another branch – this one had the tell-tale signs of beaver teeth marks. “The chatter marks, you can see the corn cob bit,” he said, excited.

Iron teeth aren’t unique to these reptiles — beaver teeth get their toughness from iron-infused enamel, says paleontologist Aaron LeBlanc of King’s College London.

His wife, Laura Valente, makes jewelry from brightly colored beaver teeth. Beavers are nocturnal, semi-aquatic mammals and are North America’s largest rodent.

Farther down, he picked up another branch – this one had the tell-tale signs of beaver teeth marks. “The chatter marks, you can see the corn cob bit,” he said, excited. Ely noted the plant ...