Dolly, the oldest rhino in the US, has died at a Tennessee zoo at age 56

This undated photo provided by Zoo Knoxville shows Dolly the rhinoceros at the Zoo Knoxville. (Amy Smotherman Burgess/Zoo Knoxville via AP)

KNOXVILLE, Tenn. (AP) — The oldest rhinoceros in the United States has died at a Tennessee zoo. Dolly was 56 years old.

In a social media post Thursday, Zoo Knoxville said Dolly was euthanized after her mobility declined significantly in recent days despite receiving old-age medical care for some time. The decision was made by Dolly's veterinary team with the help of specialists from the University of Tennessee College of Veterinary Medicine.

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