Mysterious shark 'virgin' birth
Researchers get to the bottom of the mysterious birth of sharks in a tank housing only females.
This is a modal window.
Beginning of dialog window. Escape will cancel and close the window.
End of dialog window.
This is a modal window. This modal can be closed by pressing the Escape key or activating the close button.
Researchers get to the bottom of the mysterious birth of sharks in a tank housing only females.
© Nippon Television Network Corporation