Lioness Mane

These photos provided by the Oklahoma City Zoo taken, March 25, 2017 (left), and Nov. 23, 2017, show Bridget, a lioness that has grown a mane.

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.

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