THE SWEET SIX: The Dallas Zoo welcomed the largest number of elephants at once -- affectionately called the “Golden Girls” -- to their Savanna habitat. The set of four joins two rescued Swaziland elephants in the habitat. | ABC World News Tonight with David Muir

AN UPDATE ON OUR ELEPHANTS - PART I: It's been an extraordinary 10 years since we opened our award-winning Giants of the Savanna, the habitat that set the bar for how we care for elephants in U.S. zoos. Enjoy this must-watch celebration, and join us later this week for Part II. | Dallas Zoo