Dolphins died after ravers gave them heroin substitute

TWO dolphins died a slow, agonising death during a weekend-long rave at a Swiss zoo - after party-goers fed them a heroin substitute.

Blood tests showed the underwater mammals, Shadow and Chelmers, had been given recreational drug Buprenorphine by clubbers during the controversial event.

The tablets suppressed the dolphins’ natural instinct to come to the surface for air, causing them to drown.

It was originally believed the deafening techno music at the two-day dance event, held yards from the dolphins’ pool at Connyland marine park in Lipperswil, Switzerland, had caused their deaths last November.

But toxicology tests revealed they had been fed the drug, which is used to wean addicts off heroin.       More Read