A mother and her daughter are pregnant at the same time at an Indonesian sanctuary that is home to a meaningful share of an entire species' future. Fewer than 50 Sumatran rhinos remain on Earth.

  • 34–47 Sumatran rhinos left in the wild, all in Indonesia, per the 2026 State of the Rhino report
  • 2 rhinos pregnant — Ratu and her daughter Delilah — both due in May 2027
  • 5 calves born at the sanctuary since 2012
  • 15–16 months — the species' gestation length, among the longest of any land mammal

A mother, a daughter, and a historic first

Indonesia's Ministry of Forestry and the nonprofit Yayasan Badak Indonesia (YABI) announced the pregnancies on October 3, 2026, at Taman Safari Indonesia in Bogor. Both females live at the Sumatran Rhino Sanctuary (SRS) in Way Kambas National Park, on the island of Sumatra.

Ratu, whose name means "queen," has lived at the sanctuary since 2005, after wandering into a village and being moved for her own safety. Her fourth pregnancy is by Andalas, a male born at the Cincinnati Zoo and returned to Indonesia in 2007.

Delilah is Ratu's daughter, born at the sanctuary in 2016. In 2023 she became the first Sumatran rhino born in managed care to give birth to a calf of her own, a male named Indra. Her second pregnancy is by Harapan, another Cincinnati-born male.

"Ratu and Delilah's pregnancies represent two more individuals that can help bring Sumatran rhinos back from the brink of extinction," said Nina Fascione, executive director of the International Rhino Foundation.

Why every pregnancy counts this much

The Sumatran rhino is the smallest living rhino species and the only one with a thick coat of hair — an adaptation for the dense rainforest it once ranged across, from the Himalayan foothills to Borneo. Decades of poaching and habitat loss from logging and plantation expansion reduced it to a handful of isolated pockets.

IRF built the SRS in 1996 with the Indonesian government and Taman Safari Indonesia as a semi-wild facility, where rhinos roam forest enclosures and see people mainly for medical care and reproductive monitoring. Five calves have been born there: Andatu (2012), Delilah (2016), Sedah Mirah (2022), and Anggi and Indra (2023).

The sanctuary now holds 10 rhinos and has reached capacity; IRF is fundraising to expand it. Because the entire breeding population descends from a limited number of founder animals, geneticists warn that each new pairing carries some risk of compounding relatedness — even with careful lineage tracking.

Veterinarians monitor both pregnancies through regular ultrasound checks, a technique the program adopted after earlier losses taught staff how fragile rhino pregnancies can be in the final trimester.

The long wait ahead

A Sumatran rhino typically produces one calf roughly every three years, and weaning can take up to two more. In the wild, isolation brings an added danger: females are induced ovulators, and long stretches without mating have been linked to reproductive-tract cysts that can leave them permanently infertile.

"This is part of long-term efforts to maintain the sustainability of the Sumatran rhino population through planned breeding, reproductive health management and intensive monitoring of individual rhinos," said Dr. Ahmad Munawir, the Ministry of Forestry's director of species and genetic conservation.

If both calves are born healthy next May, they will mark the sanctuary's sixth and seventh births since 2012 — a slow but real climb back from the edge for one of the rarest large mammals on the planet.