Sharks have internal fertilization. After fertilization, sharks may have three different kinds of embryo development - depending on the species.

Some are oviparous, which means they lay eggs.

Some are viviparous, which means pups are born live.

Others are ovoviviparous. This can best be described as a combo of oviparous and viviparous. The embryo, which is attached to a yolk sac (to gets its nutrients) develops in the female.   After it matures it is then born live. 

We can't save sharks...alone. Make a difference, please join us May 13, 2011 for
Fintastic Friday: Giving Sharks a Voice

 

Fintastic Friday Highlighted in New Book! Order your copy today!

National Geographic Kids Everything Sharks     Musgrave, Ruth A. March 2011 (ISBN 9781426307690)

 

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