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Rooney Mara, Kate Mara

Carol Guzy/For the HSUS

Sisters Rooney Mara and Kate Mara are using their Hollywood star power for good!

The talented actresses have written an open letter to the New York Blood Center in response to their "abandonment" of more than 60 chimpanzees in Liberia. After the organization withdrew their support of the animals after more than 30 years, the Mara sisters believe they have left the creatures to survive on their own without food or water.

"As you are aware, when you withdrew all support for these chimpanzees one year ago, you left them in a life-threatening situation," Rooney and Kate wrote in their open letter to the President and CEO of the New York Blood Center. "If it had not been for the dedicated caretakers and emergency care from nonprofit organizations like The Humane Society of the United States and Humane Society International, these chimpanzees would surely have died horrible, slow and painful deaths from dehydration and starvation."

Recently, the Mara sisters were able to travel to Liberia where they visited the chimpanzees and their dedicated caretakers. With the help of The Humane Society, the animals have been able to defy expectations. Unfortunately, it's costing the organizations upwards of $20,000 per month.

Rooney Mara, Kate Mara

Carol Guzy/For the HSUS

"Despite the physical and emotional trauma these animals have endured…they are doing amazingly well," the open letter stated. "The resilience of these animals is astonishing and humbling to say the least."

So what is the end goal to this public letter? The Mara sisters hope that the New York Blood Center can "correct the wrongdoings of the past" and help the chimpanzees and the people of Liberia.

"It's never too late to choose compassion over indignity," Kate and Rooney wrote. "We urge you to work with The Humane Society of the United States to determine a solution that would be beneficial for the chimpanzees and for the people of Liberia who depended on you."

Learn how you can get involved and help the cause by visiting The Humane Society of the United States' website