mastodon

For millions of years, North America was home to a zoo of giants: mammoths and mastodons, camels and dire wolves, sloths the size of elephants and beavers as big as bears.

The shrub-like oak tree has been a fixture of the landscape since mastodons and saber-toothed cats last roamed Southern California.

Nonetheless, the tree has been a fixture of the landscape since mastodons and saber-toothed cats last roamed Southern California.

They also have found small pieces of mastodon tusk, but nothing this big and intact.

"Elephants don't get much cancer. Their ancestors, long before mastodons, were much smaller, so how, en route to today's size, did they avoid cancer?" he wondered.