Ocean Park’s six-year-old dolphin, Cleo, died on Sunday of unknown health problems that lasted more than a week, the park announced.The female Indo-Pacific bottlenose dolphin had no health problems before the illness, but was placed under veterinary care after she started to display a reduced appetite and high body temperature on April 18, a spokeswoman said.Despite attempts to save her, the dolphin’s health worsened on Friday and she died on Sunday. An autopsy will be conducted to determine…