A pair of dolphins may have died after being fed drugs by ravers after a second animal died. Police looking into the deaths in Connyland, Lipperswil, Switzerland, initially thought the deafening music from the rave may have killed dolphins Shadow and Chelmers. But zoo vets are awaiting toxicology test results to see if they were poisoned by narcotics thrown into their enclosure during the rave. Shadow was found soon after the event but Chelmers died two days later after a 'drawn out and painful' death. Connyland keeper Nadja Gasser told local media: 'The death was very drawn out and painful....