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Sharks have young in three different ways. After internal fertilization, some...
Sharks caught in nets
Shark nets are trapping and killing dozens of sharks off the coast of South Africa....
Fossil tooth spiral
This fossil tooth whorl of the ancient shark Helicoprion, dates back 290 million...
Two fossilized teeth from a megalodon (Carcharodon megalodon) dating back more than...
Giant Megatooth Model
A life-sized model suspended over visitors at the San Diego Natural History Museum...