Royal Oak – The Detroit Zoo says an 11-year-old gray wolf has died during surgery to remove a mass in her chest.

Zoo officials say Wazi suffered cardiac arrest and died Monday. The mass had been discovered during a health exam, and veterinarians determined surgery was the only option because of its size and location.

The zoo says in a statement the wolf “was intelligent, fearless, curious and sassy,” and “adored” by employees, volunteers and visitors.

The zoo’s lone surviving wolf is a male named Kaska.

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