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 These photos provided by the Oklahoma City Zoo taken, March 25, 2017, left, and Nov. 23, 2017, right, show Bridget, a lioness that has grown a mane. The zoo says a blood sample has detected the reason... (Associated Press) 
 
 These photos provided by the Oklahoma City Zoo taken, March 25, 2017, left, and Nov. 23, 2017, right, show Bridget, a lioness that has grown a mane. The zoo says a blood sample has detected the reason why one of its African lionesses has grown a mane. The zoo says in its March newsletter that testing... (Associated Press) 
 
 These photos provided by the Oklahoma City Zoo taken, March 25, 2017, left, and Nov. 23, 2017, right, show Bridget, a lioness that has grown a mane. The zoo says a blood sample has detected the reason why one of its African lionesses has grown a mane. The zoo says in its March newsletter that testing... (Associated Press) These photos provided by the Oklahoma City Zoo taken, March 25, 2017, left, and Nov. 23, 2017, right, show Bridget, a lioness that has grown a mane. The zoo says a blood sample has detected the reason... (Associated Press) 
 
 OKLAHOMA CITY (AP) — Lab results have revealed the answer to a mystery at an Oklahoma zoo: Just what caused a female lion to sprout a mane. 
 
 The Oklahoma City Zoo says in its March newsletter that testing at the University of Tennessee found the African lioness named Bridget has an elevated level of androstenedione, a hormone that can contribute to developing male features. 
 
 Veterinarians compared Bridget's blood to samples from her sister, who has no mane. Bridget's blood also contained a higher level of cortisol, which regulates metabolism and the immune system. 
 
 The zoo says the results likely mean the 18-year-old lioness has a benign tumor that's producing the hormones, but that her health is excellent. 
 
 The zoo says female lions with manes are not unheard of, but they are rare. 

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 OKLAHOMA CITY – Veterinarians at the Oklahoma City Zoo and Botanical Gardens say they have solved the mystery after an 18-year-old African lioness grew a small mane. 
 
 Last month, zoo officials said they were looking into why Bridget, the zoo’s 18-year-old African lioness, had suddenly spouted a mini-mane. 
 
 Male lions usually begin growing a mane when they are about 1-year-old, which is when they begin producing more testosterone. 
 
 However, it is extremely rare for a female lion to grow a mane. 
 
 Dr. Jennifer D'Agostino, the director of veterinary services at the zoo, announced that the medical mystery is solved. 
 
 Veterinarians took a blood sample from Bridget and her sister, Tia, to use as a side-by-side comparison to see what could be causing the mane growth. 
 
 They found that Bridget has elevated levels of two different hormones- cortisol and androstenedione. Androstenedione is actually a precursor to testosterone, which is the cause for mane growth in male lions. 
 
 D'Agostino says that Bridget may have a small benign tumor in her adrenal gland, which is leading to the increased hormones. 
 
 Veterinarians say they will continue to monitor her closely, but add that her condition is not likely going to affect Bridget’s quality of life. They add that she will keep her mini-mane as long as treatment isn't necessary.
– Lab results have revealed the answer to a mystery at an Oklahoma zoo: Just what caused a female lion to sprout a mane. The Oklahoma City Zoo says in its March newsletter that testing at the University of Tennessee found the African lioness named Bridget has an elevated level of androstenedione, a hormone that can contribute to developing male features. Veterinarians compared Bridget's blood to samples from her sister, who has no mane. Bridget's blood also contained a higher level of cortisol, which regulates metabolism and the immune system, the AP reports. The zoo says the results likely mean the 18-year-old lioness has a benign tumor in her adrenal gland that's producing the hormones, but that her health is excellent. KFOR reports treatment isn't necessary right now, and that she'll keep the mane for as long as that remains the case. For male lions, testosterone production steps up around age 1, which is when they usually begin growing a mane. The zoo says female lions with manes are not unheard of, but they are rare. Indeed, National Geographic reports on a case from 2011 in which a 13-year-old lioness kept in a South African zoo similarly developed a mane; in her case, the mane was traced to a "virtually unheard of" issue with her ovaries. (A "lion whisperer" took three lions for a walk; it did not end well.)