What is the 'Betty White Challenge'? How fans are honoring the actress' love of animals

Fans of the late Betty White have found a great way to honor the beloved actress.

The "Betty White Challenge," an online event set for Jan. 17, on what would've been the TV icon's 100th birthday, has been gaining steam among fans online. The social media challenge encourages people to donate $5 to animal rescues or shelters in her name.

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Dr. Robin Ganzert, president and CEO of American Humane, told "Good Morning America" Thursday the organization has already "seen such an uptick in donations" following White's death.

White, best known for her television roles as Sue Ann Nivens on "The Mary Tyler Moore Show" and Rose Nylund on "The Golden Girls," was known for her love of animals.

In 2011, she published a book, "Betty & Friends: My Life at the Zoo," in which she spoke about her work with animal nonprofits.

White died on Dec. 31 at the age of 99. Jeff Witjas, her close friend and agent, told ABC News the Emmy winner died of natural causes in her sleep.