Now, the hammerhead has that really unusual ... However, I must admit that I started studying sharks because I thought they were scary and little was known about them. I loved animal behavior ...

Hammerhead sharks don’t lay eggs, though. They gestate their pups in utero. A pregnant shark carries up to 16 embryos, each nourished by an umbilical cord, just like human embryos are.

I was once at the surface playing low-frequency sounds over a speaker to attract sharks. A hammerhead shot up from beneath me, rushing at me at perhaps 30 feet a second before he suddenly turned ...

Not all sharks are big and scary, though. A NOAA biologist found this tiny pocket shark off the coast of the Gulf of Mexico, only the second one that's ever been seen. It weighs about as much as ...