Mara the Lioness domesticated dog. Along with animal lovers, naturalists and experienced game wardens, they held the belief that integration back into the wild would harm Mara, rather than benefit. Mara did not fear man and indeed went out of her way to approach and play. This posed an enormous risk to her safety. In addition, release into the wild would place Mara and the other lionesses at risk of contracting "Babesia". Domesticated animals have no resistance to the fatal disease, a fact which George and Joy Adamson knew. Their lion Elsa had died of the same disease not less than two years
Joy Adamson each other to educate her, but after she died and her cubs were taken in by the park, their interests went in separate directions, as did their lives. While neither wanted a divorce nor a legal separation, their conflicting interests (George wanted to continue to work with lions and she with cheetahs) made it necessary for them to live apart (though they sometimes discussed living together again, they never did). They spent each Christmas together and they remained on good terms. Using her own notes and George's journals, Joy wrote "Born Free" to tell the lion's tale. She submitted it