A 14-year-old male African lion has been euthanized at a suburban Chicago zoo.
Brookfield Zoo said Zenda was struggling to stand and walk. A necropsy revealed degenerative discs in his spine that had ruptured because of his age.
Zenda had lived at the zoo since 2008. The zoo said it would keep a close eye on Isis, a 14-year-old female lion, who had a close relationship with Zenda.