In the middle of what's been called her "career renaissance" -- Superbowl ads, her Saturday Night Live hosting gig and the Facebook campaign that led up to it, and now her new TV Land sitcom Hot In Cleveland -- Betty White still thinks of acting as "just a hobby." Just as dear to her heart is another hobby: her frequent visits to the Los Angeles zoo.

ABC's Nightline joins White "on safari" through the zoo tonight to talk about her life, her passion for animals and her six decades as a beloved TV actress, from The Mary Tyler Moore Show to Golden Girls to Boston Legal. Just last week, White saw the last of her remaining Golden Girls co-stars, Rue McClanahan, pass away.

Watch a sneak peek of the interview below, and catch the full story tonight at 11:35pm on ABC.