'Seemingly impossible': Endangered tortoise becomes first-time mom at about 100 years old

A photograph of Mommy, a 100-year-old tortoise at Philadelphia Zoo.

An endangered giant tortoise has become the oldest first-time mom of her species after having her first babies at around 100 years old.

Philadelphia Zoo recently hatched eggs laid by an elderly western Santa Cruz Galápagos tortoise (Chelonoidis niger porteri), named Mommy. Her exact age is unknown, but Mommy has been at the zoo for more than 90 years.