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Reproductive Biology

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National Zoo Confirms Elephant Nhi Linh’s Pregnancy, First Expected Calf in Nearly 25 Years

Caretakers are preparing the herd for a closely monitored winter delivery to bolster Asian elephant conservation efforts.

Philadelphia Zoo Unveils 16 Critically Endangered Galápagos Tortoise Hatchlings From Century-Old Pair

135-Year-Old Galapagos Tortoise Fathers First Hatchling at Zoo Miami