Skip to main content
Hawaiian monk seal RH38 gets a CT scan
Press Release

Endangered Hawaiian Monk Seal Heads Home to Kauaʻi After Receiving Life-Saving Care

November 21, 2023
  • Species conservation

Hawaiian monk seal RH38 previously received care at the Center’s Hawai‘i Island-based hospital in 2017 and 2019

The Marine Mammal Center, the world’s largest marine mammal hospital, is happy to announce the successful release of Hawaiian monk seal RH38 back to Kauaʻi.

video by Stefanie Cooke © The Marine Mammal Center / NOAA permit #24359

Since her rescue in June, the Center had been treating the adult female seal for a series of ailments including kidney stones, suspected pneumonia and a fractured upper left canine tooth at Ke Kai Ola, the Center’s Hawaiian monk seal hospital in Kailua-Kona. The successful rescue, treatment and release of RH38 was made possible thanks to the Center’s partnership with the National Oceanic and Atmospheric Administration (NOAA), Kona Community Hospital and the U.S. Coast Guard (USCG).

“We’re ecstatic to give an animal that’s so dear to our hearts, like RH38, another chance in the wild. Every seal matters for an endangered population,” says Dr. Sophie Whoriskey, Associate Director, Hawaiʻi Conservation Medicine at The Marine Mammal Center. “It was clear during her treatment that her tooth fracture, and the associated infection, was the primary cause of her inability to thrive in the wild and we’re confident this won’t impact her anymore.”

During RH38’s nearly five months of treatment, a CT scan conducted in August by experts at Kona Community Hospital confirmed the severity of the tooth fracture and infection.

The Center’s veterinary team performed additional diagnostics including full body radiographs (X-rays), extensive abdominal ultrasound exams and submitted a series of blood samples for diagnostic testing to check for signs of toxins or infectious disease. All tests came back negative.

Animal care experts offered RH38 a hearty and calorie-rich diet of sustainably caught herring and she gained an impressive 100 pounds while in treatment.

Learn More About Hawaiian Monk Seals

Sign up to receive Hawaiian monk seal news, patient updates and more straight to your inbox.

A Timely Release for a Seal Ready to Go Home

On November 13, experts at the Center noticed RH38 began to exhibit signs of significant behavioral stress that included the animal biting at its tail. While it’s not unusual for monk seals to display stress related behavior while in a rehabilitation setting, this seal’s stress behaviors were more severe.

Fortunately, RH38 had already passed a release exam and timing worked out so that the Center’s team and partners at NOAA and USCG were able to coordinate an immediate release in the best interest of her health.

The next day, the Center’s team met with USCG crew members at Kona International Airport to help load RH38 onto a C-130 aircraft for release back to Kauaʻi.

“This has truly been a monk seal ‘ohana (family) effort,” said Jamie Thomton, NOAA’s Kauaʻi Marine Wildlife Response Coordinator. “RH38’s homecoming was a collective effort, and we especially want to thank our Kauaʻi volunteers and community members. They’ve helped monitor RH38 over the years, and their reports earlier this year alerted us that something was wrong. Our Kauaʻi team came together to rescue her, and with the partnership of the Center and U.S. Coast Guard, RH38 was successfully rehabilitated and released back to her Kauaʻi home.”

NOAA, the Hawaiʻi Department of Land and Natural Resource, and the rest of the Kauaʻi monk seal ʻohana will continue to keep a watchful eye on RH38 as she gets back into her routines around the Garden Island.

RH38 was born in 2016 and was first admitted to Ke Kai Ola in 2017 for malnutrition and gastrointestinal parasites. She was released in good health and came back in 2019 with several health concerns, including severe traumatic myositis (muscle inflammation) that was diagnosed on CT scan, septicemic infection, kidney stones in both kidneys, urinary tract infection and presumed pneumonia.

Since 2014, the Center has rehabilitated and released 45 monk seals, excluding RH38 who has been released three times. Most of these seals have been rescued from and returned to Papahānaumokuākea Marine National Monument as part of the Center’s partnership with NOAA Fisheries. Together, the Center works with NOAA to identify seals in need, rescue and rehabilitate them, and give them a second chance at life.

The Center’s partnership with NOAA Fisheries and other cooperating agencies is more important than ever to prevent this endangered species from becoming extinct.

Volunteer Opportunities on Hawaiʻi and Maui

The Marine Mammal Center is recruiting new volunteers for operations on Hawai‘i Island and Maui. Learn more about volunteering and sign up to attend upcoming trainings.

Hawaiian monk seal conservation volunteers play an integral role in helping save this endangered species by monitoring and identifying seals that may require rescue and rehabilitation. Volunteers also provide valuable public outreach to help raise awareness about the risks of human and pet interactions, and why this native animal is critical to the health of our shared ocean home.

Yes! I want to volunteer!

The Center values volunteer engagement and inclusivity, and is proud to welcome existing and new volunteers into its ohana, or family, to create an even more robust and diverse community of volunteers.

For more information or to set up an interview on this topic, please contact us at


Header image: Photo by Sophie Whoriskey © The Marine Mammal Center / NOAA permit #24359

Yes, I want to save a life!

Yes, I want to save a life!

You’ll be giving sick and injured animals the best possible care at the Center’s state-of-the-art hospital. With your gift today, you are giving a patient a second chance at life in the wild.

  • $35 You'll buy food for a hungry animal
  • $45 You'll provide life-saving medical care
  • $65 You'll make second chances possible

See Our Latest News

species conservation
Sophie Whoriskey
Hawaiian Monk Seal