An Arizona animal attraction is under fire after the death of a third dolphin in 16 months. Protesters have demanded the release of the remaining five dolphins at Dolphinaris Arizona in Scottsdale, which opened in October 2016 and allows visitors to interact with the aquatic mammals. A Dolphinaris manager said Khloe, an 11-year-old bottlenose dolphin, had a chronic illness caused by a parasite that also affects dolphins living in the ocean, the Arizona Republic reports. But Patricia Cady, a co-founder of Dolphin Free AZ, said three deaths are a sign something is amiss. “Even within the industry—that we do not support—it is an anomaly,” she said. The attraction has passed all four of its U.S. Department of Agriculture inspections.