Basking sharks are the second biggest fish on the planet, up to 40 feet long and four tons in weight. While these massive sharks are typically solitary, they have recently been found gathering together. And no one knows why.
Aired:
| Expires: | Runtime: 2m 53s
You are leaving GBH.org
You are leaving gbh.org and going to a web page that is not owned by GBH. If you are streaming, your experience will be interrupted.