PHILADELPHIA, PA — The Philadelphia Zoo has achieved a monumental milestone in its 150+ year history with the successful hatching of four critically endangered Western Santa Cruz Galapagos tortoises. This remarkable achievement marks the first time the Zoo has successfully bred this species, reinforcing its commitment to wildlife conservation and education.
A Century in the Making
The proud parents, Mommy and Abrazzo, hold a unique place in the Zoo’s history. Both are estimated to be around 100 years old, making them the Zoo’s oldest residents. Their lives have come full circle with the arrival of their hatchlings, an extraordinary fulfillment of decades of conservation dedication. Mommy, who has lived at the Zoo since 1932, is not only one of the most genetically significant tortoises in the Association of Zoos and Aquariums (AZA) Species Survival Plan but also the oldest first-time mother of her species in the history of U.S. zoos.
“[These] newest additions represent a new genetic lineage and some much-needed help to the species’ population,” said Ashley Ortega, Galapagos Tortoise SSP Coordinator from Gladys Porter Zoo, Texas.
A Conservation Success Story
The hatchlings are part of a collaborative AZA Species Survival Plan breeding initiative aimed at saving the Western Santa Cruz Galapagos tortoise from extinction. Classified as critically endangered by the International Union for Conservation of Nature (IUCN), the species faces numerous threats, including habitat loss, invasive species, and human-wildlife conflict. With only 44 individual Western Santa Cruz Galapagos tortoises in all U.S. zoos prior to this hatching, these new additions provide much-needed hope for the future.
“These hatchlings not only protect the species from extinction, but also serve as ambassadors to inspire guests to save wildlife and wild places,” said Dr. Jo-Elle Mogerman, President & CEO of Philadelphia Zoo.
How the Hatchlings Entered the World
Mommy laid a clutch of 16 eggs in November 2024, from which eight were incubated at specific temperatures to ensure female hatchlings, as sex determination depends on incubation conditions. After months of careful monitoring, the first hatchling emerged on February 27, 2025. Each weighs a mere 70–80 grams, about the weight of a chicken egg.
The eggs were incubated by the Zoo’s skilled herpetology team, a process that required meticulous attention. “This is a monumental achievement for our animal care team, which works tirelessly to provide the exact conditions required for such a momentous outcome,” said Lauren Augustine, Director of Herpetology and Birds.
Mommy’s genetic contribution to the AZA population is invaluable. “Until now, Mommy’s genes weren’t represented in U.S. zoos, making these hatchlings a crucial addition to the population,” Augustine added.
Meet the Hatchlings
The public will get their first chance to meet these historic hatchlings on April 23, 2025, which fittingly marks the 93rd anniversary of Mommy’s arrival at the Zoo. Until their debut, the hatchlings are being cared for behind the scenes at the Zoo’s Reptile and Amphibian House, where they are eating, growing, and thriving. Their arrival also brings the Zoo’s Galapagos tortoise collection to seven individuals, joining Mommy, Abrazzo, Little Girl, and two Aldabra tortoises, Wilma and Betty.
Starting April 23, guests can see the hatchlings in person, participate in naming opportunities, and even support their care through the Zoo’s ADOPT program.
Why Protecting Galapagos Tortoises Matters
Native to the Galapagos Islands, these tortoises are the largest living species of tortoise, with males weighing up to 500 pounds. Known for their long lifespan—scientists estimate 100–200 years—they play a vital ecological role in their native habitats, aiding in seed dispersal and maintaining vegetation. Unfortunately, several subspecies of Galapagos tortoises have already been declared extinct, making efforts to conserve the surviving species even more urgent.
Philadelphia Zoo’s Commitment to Conservation
Philadelphia Zoo has long been at the forefront of wildlife conservation and education. Its active participation in global Species Survival Plans ensures critical contributions to animal welfare and biodiversity worldwide.
“Philadelphia Zoo’s vision is that these hatchlings will be part of a thriving population of Galapagos tortoises on a healthy planet a century from now,” said Mogerman.
Zoo members and visitors alike can play a vital role in fostering this vision. Visitors can meet Mommy and Abrazzo through exclusive behind-the-scenes tours offered on Mondays, Thursdays, and Saturdays at 2 PM. Proceeds from these experiences, along with contributions from the community, directly support ongoing conservation efforts.
Plan Your Visit and Get Involved
Join the Zoo on April 23, 2025, to celebrate this historic achievement and meet the newest members of the Galapagos tortoise family. Tickets are available now at philadelphiazoo.org.
For updates on the hatchlings, exclusive naming opportunities, or ways to contribute through the ADOPT program, follow Philadelphia Zoo on:
- Facebook: PhiladelphiaZoo
- Instagram: @philadelphiazoo
- Twitter: @phillyzoo
These remarkable hatchlings symbolize more than just survival—they represent the incredible power of collaboration, expertise, and hope in conservation.
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