When Daniel the orangutan arrived at the Phoenix Zoo in Arizona, he was in rough shape.

He was suffering from a respiratory disease, which, just like in humans, can worsen and even lead to death when untreated.

The stakes were high, especially considering that orangutans are a highly endangered species. And respiratory illnesses can be even more dangerous for orangutans which have an inflatable air sac that can be vulnerable when it becomes infected. Located in their throats, these air sacs are helpful in allowing orangutans to sustain the loud calls they're known for by creating a chamber for the sound to resonate within, but these air sacs are also prone to infection.

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Dignity Health

On May 10, 2017, actor and activist Leonardo DiCaprio took to Twitter to save a marine species.

"The vaquita is the most endangered marine mammal in the world," he wrote of the species, which can only be found off Mexico's shores in the Gulf of California. "Join me [and the World Wildlife Fund] and take action."

It may seem like an average tweet, coming from one of the biggest environmental advocates in the world. But the tweet has had global ramifications.

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Heroes

Natasha Rossi believed she had the perfect life.

She had two awesome kids — two and a half-year-old identical twins — and the love and support of her boyfriend, Desi. Life, she thought, could only get better.

All photos via Upworthy/Walgreens.

Then, in January 2019, she was hit with some of the hardest news that anyone can hear.

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In late March 2016, World Wildlife Fund researchers celebrated the reappearance of the incredibly rare Sumatran rhino.

Image from International Rhino Foundation/WIkimedia Commons.

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