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100-Year-Old Critically Endangered Tortoise Becomes The Oldest First-Time Mom Of Her Species

Left image shows the 100-year-old Galapagos tortoise that gave birth. Right image shows one of the four hatchlings eating.

Charles Darwin discovered the Galapagos tortoise while sailing on the HMS Beagle in 1835. He noted the shells’ unique shape and gigantic size. Experts estimate that the tortoises have inhabited the Galapagos Islands for more than two million years. The ancient reptiles have a lifespan of 100 to 200 years. These animals are in the news because a 100-year-old female just gave birth for the first time.

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Two 100-year-old, critically-endangered Western Santa Cruz Galapagos tortoises have just become first-time parents. The tortoises, named Mommy and Abrazzo, just had four of their eggs hatch. The Philadelphia Zoo says the female, Mommy, is the oldest first-time mom of her species in the world. Since 2023, Mommy has laid four clutches of eggs, but the last three didn’t result in viable eggs. The current hatchlings were laid in November 2024. Zoo officials dug them up to incubate eight as male and eight as female. The sex of the hatchlings is determined by the incubation temperature, with temperatures below 82.4°F producing males and above 85.1°F producing females. The baby tortoises that have hatched were incubated as female. The zoo says the species is listed as critically endangered with threats including human-wildlife conflict, the introduction of invasive species and habitat loss.

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Born from the mating of Abrazzo and Mommy, these four hatchlings are the first births of Western Santa Cruz Galapagos tortoises at the Philadelphia Zoo. The species is critically endangered. Although their exact ages aren’t known, Mommy and Abrazzo are estimated to be around 100. So far, there are only four hatchlings, but zoo personnel are monitoring additional eggs, hoping they will also produce hatchlings.

Mommy and Abrazzo are the oldest residents in the zoo. Mommy arrived at the zoo in 1932. She has laid eggs in the past, but none were viable. Abrazzo arrived in 2020 specifically for the breeding program. The incubation temperature determines the sex of the Galapagos tortoise hatchlings, so zoo personnel can select how many male and female hatchlings they need to keep the species growing. The first four hatchlings are all female.

Images show two of the four Galapagos tortoise hatchlings.
Images from Facebook here and here.

The zoo will allow visitors to see the hatchlings on April 23, 2025, inside the Reptile and Amphibian House. The hatchlings will stay at Philadelphia Zoo for their first five years. After that, they may travel to new locations to continue rebuilding the species. There might be news about additional hatchlings soon. Follow the Philadelphia Zoo on Facebook for information on how you can help the zoo name the new Galapagos tortoises.

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