The hatchling's parents are the zoo's two oldest residents, each estimated to be around 100-years-old.

The zoo on Wednesday debuted its four female Western Santa Cruz Galapagos tortoise hatchlings, moving them to their public habit for all to see for the first time. The occasion is something of a monumental one for the Philadelphia Zoo, which bred and hatched the baby tortoises in-house — a first in its 150-year history.