Galapagos tortoises at Philadelphia Zoo become first-time parents at nearly 100

A pair of critically endangered, nearly 100-year-old Galapagos tortoises at the Philadelphia Zoo have become first-time parents.

​ A pair of critically endangered, nearly 100-year-old Galapagos tortoises at the Philadelphia Zoo have become first-time parents. Read More Breaking News, Latest News and Videos | CNN