In a zoo blog post about the curious case, Bridget's keepers claim the growth occurred from March to November Caretakers discovered this was caused by a deformity in the lioness's ovaries, which contained cells normally found in testicles causing an increased level of testosterone. Unlike other males at the zoo, Bridget's mane only covers part of her face. Some males, like the infamous Tsavo man-eaters, are maneless, but a study found they may have evolved this feature to keep cool in blistering heat. As for Bridget, who was born in captivity, none of her fellow littermates have manes. In Botswana's Okavanago Delta , maned lionesses are regularly spotted , likely the result of a genetic anomaly shared by related animals. Male lions typically start growing manes at about a year old, when they begin producing testosterone.
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