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The future was looking uncertain for a group of more than 60 chimpanzees that formerly served as laboratory research subjects for the New York Blood Center (NYBC) in Liberia — until the Humane Society of the United States (HSUS) recently stepped in to take over their care.

The chimps, which were raised in captivity and could not be released into habitats with wild chimpanzees, had been placed in a Liberian island sanctuary more than 10 years ago, after the NYBC ended the local research program that used the chimps to test a hepatitis B vaccine, in 2004. But the NYBC struggled to determine who would ultimately be responsible for the primates in the long term. And years later, time and money were running short.

Fortunately for the chimps, the HSUS and the NYBC reached an agreement to provide for the animals' ongoing health and medical needs, with the HSUS assuming responsibility for the chimpanzees for the duration of the animals' lives, and the NYBC contributing $6 million to the sanctuary's upkeep, HSUS representatives said in a statement. [Grooming Gallery: Chimps Get Social]

The retired chimps in Liberia have a lot of fellow retiree chimps in the U.S., ever since the National Institutes of Health (NIH) banned all research using chimpanzees in 2013. Like the chimps in Liberia, their U.S. counterparts were relocated to sanctuaries such as Chimp Haven, a facility in Louisiana, and others.

At the Liberian sanctuary, which extends over a series of river islands, there are no cages or enclosures, and the chimps live with their social groups. Food, water and medical attention are delivered by caregivers, NYBC representatives explained on the organization's website.  

More than 60 chimpanzees were released to live on river islands in Liberia following the closing of a research lab where they were test subjects for a hepatitis vaccine.
More than 60 chimpanzees were released to live on river islands in Liberia following the closing of a research lab where they were test subjects for a hepatitis vaccine.
Credit: The Humane Society of the United States

The NYBC founded the Liberia chimp colony and the hepatitis vaccine research lab in 1974. Contracts with the Liberian government designated the chimpanzees as the property of the Liberian Institute for Biomedical Research (LIBR), a division of the Liberian Ministry of Health, according to the NYBC.

Though the LIBR was expected to assume control of the chimpanzee sanctuary in 2007, as per their contracts with NYBC, that did not happen, and the NYBC continued to provide the animals with the necessities for their survival. But nearly a decade later, the NYBC couldn't afford to continue its voluntary support of the multimillion-dollar effort, representatives explained on the NYBC website.  

"Unfortunately, NYBC could no longer sustain diverting millions of dollars away from our lifesaving mission of providing patients over one million critically needed blood products each year," NYBC representatives said.

Taking over the chimps' care from the New York Blood Center, the Humane Society of the United States will care for the Liberian chimps for the rest of the animals' lives.
Taking over the chimps' care from the New York Blood Center, the Humane Society of the United States will care for the Liberian chimps for the rest of the animals' lives.
Credit: The Humane Society of the United States

In 2015, the HSUS became involved in the chimpanzees' plight, culminating in the group's recent announcement that it would take on the care of the chimps for the duration of their lives. The HSUS will even construct basic shelters for the groups of primates, which include male and female chimps that range from infants to elders, according to HSUS representatives.

"The HSUS will work with its members and others to find the resources to make sure these chimpanzees know only human kindness for the remainder of their lives," Wayne Pacelle, president and CEO of the HSUS, said in a statement.

And the chimpanzees' life spans could be considerable; chimps are known to live to be 40 to 45 years old in the wild and as much as 60 years old in captivity, according to the National Primate Research Center at the University of Wisconsin in Madison.

Original article on Live Science.