Here: Polar Bear
Credit: US Fish & Wildlife Services
Gone: Giant Ape
Here: Great White Shark
Credit: Credit: Jeremy Stafford-Deitsch, www.sharktrust.org
Gone: Mega Shark
Credit: LiveScience Illustration
Credit: Elephant image Shutterstock
Credit: Photo by Jonathan S. Blair/National Geographic
Credit: Julie Larsen Maher, WCS.
Gone: Saber-Toothed What?
Credit: Credit: California Blue Book; Statutes of California; California Government Code
Credit: Credit: Lars Lenitz / Stock.XCHNG
Credit: U.S. Department of the Interior, Bureau of Land Management.
Credit: Honolulu Zoo
Credit: Credit: John De Boer / Stock.XCHNG
Here: Elusive Squid
Credit: AP Photo/HO, National Science Museum
Credit: Credit: AquaMarine Images Photo Gallery