Fifty years ago, Joy Adamson wrote “Born Free.” The best-selling book, which recounts how she and her husband were surrogate parents to a lion cub in Africa, in 1966 was made into an award-winning film of the same name. This Sunday evening, PBS looks back at the book, the movie and how they changed the way people think about conservation and lions with “Elsa’s Legacy: The Born Free Story.” It touches on the compassion-to-all-creatures philosophy that drives our mission here at Born Free USA. After watching the documentary, share your thoughts with us — in 150 words or fewer — about how the book or movie impacted the way you think about wild animals and you could win an autographed copy of Virginia McKenna’s autobiography “The Life in My Years.” (Please include your hometown in your e-mail.) We’ll publish some of our favorite responses in this space.