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The Amazonian manatee is the region’s largest mammal but is rarely seen, much less up close. The reasons for this are twofold: The manatee has acute hearing and will vanish into the murky water at the slightest sound; and its population has dwindled after being overhunted for hundreds of years, mostly for its tough hides that were exported to Europe and Central America.

To help the manatee population recover, several institutions are rescuing orphaned manatee calves, rehabilitating them and reintroducing them to the wild.

Bacuri's story

Bacuri weighed just 22 pounds (10 kilograms) — a fraction of the more than 900 pounds (400 kilograms) of an adult manatee — when he was rescued and taken to the federally protected Caxiuana ��ɫtv Forest. He was named after the local community that found him. Two years and several thousand milk bottles later, Bacuri has grown to about 130 pounds (60 kilos).

Three institutions are responsible for his care. The Goeldi Museum provides facilities and educates nearby communities. The federal Chico Mendes Institute for Biodiversity Conservation assigns two staffers for 15-day shifts to feed Bacuri three bottles of milk a day as well as chopped beets and carrots, and clean the pool every 48 hours. The nonprofit Instituto Bicho d'Agua — meaning institute of water animals in Portuguese — oversees veterinary care, dietary planning and caregiver training.

During their visit, the children learn that female manatees are pregnant for about a year then nurse their young for two more, feeding them from nipples behind their front flippers — the manatee equivalent of armpits. This long reproductive cycle is one reason the manatee population has not recovered from the commercial hunting that persisted until the mid-20th century.

They also learn the species is endangered and that they are the ones who must protect it.

“You are the main guardians,” biologist Tatyanna Mariúcha, head of the Ferreira Penna scientific base, tells the children, who spend the rest of the day drawing and making Play-Doh models of Bacuri.

Local knowledge is key

With its auditorium, dormitories, observation towers, cafeteria and laboratories, the research station — two hours by speedboat from Portel, the nearest city — stands in stark contrast to nearby communities comprising clusters of wooden houses on stilts where families rely on cassava farming, fishing and harvesting açaí berries. School field trips and community outreach aim to narrow the gap.

“Caxiuana is their home,” Mariúcha told The Associated Press. “We can’t just come here and do things without their consent.”

Local knowledge will play a key role when Bacuri is finally released. He is the only manatee calf under care at Caxiuana. Once he has fully transitioned to a plant-based diet, he’ll spend time in a river enclosure before his release. That site will be selected based on where residents say wild manatees feed and pass through.

If all goes as planned, Bacuri will be the first manatee released in the Caxiuana area. Two other calves rescued in poor health died in captivity, a sadly common outcome.

While subsistence hunting isn’t a major threat to the species, some fishermen still sell manatee meat illegally in nearby towns. Brazil banned hunting of all wild animals in 1967, with two exceptions: are allowed to hunt, and others can kill a wild animal to satisfy the hunger of the hunter or his family.

The impact of climate change

The threat of hunters has become harder to manage due to climate change, said Miriam Marmontel, a senior researcher at the Mamirauá Institute for Sustainable Development, hundreds of miles (kilometers) upstream along the Amazon River.

Dozens of dolphins died near Mamiraua in 2023, likely due to during a historic drought. Manatees avoided mass mortality then because they typically inhabit deep pools during the dry season, but have making manatees more vulnerable to poachers.

“As climate change accelerates, manatees may begin to suffer from heat stress too,” Marmontel said. “They also have a thermal limit, and eventually it may be crossed.”

That’s why reintroduction efforts are so important.

Around 60 rescued manatees are being cared for across the state of Para, where Caxiuana is located. Bicho d’Agua is caring for four in partnership with the Federal University of Para and Brazil's environmental agency. One of the four, named Coral, was found near Obidos and airlifted 620 miles (1,000 kilometers) to the institute's facility in Castanhal. She arrived dehydrated and with severe skin burns, likely from sun exposure.

“The population has declined so much that every hunted animal impacts the species,” Renata Emin, president of Bicho d’Agua, told AP. “That’s why any effort matters, not just because one individual may return to the wild and help rebuild the population but because of the community and government engagement it inspires.”

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