Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.

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References

1What does a dolphin use to get high? A toxic puffer fish that makes them lapse into a trance-like state
http://www.dailymail.co.uk/sciencetech/article-2530664/High-not-dry-Dolphins-filmed-chewing-toxic-puffer-fish-enjoy-narcotic-like-effects.html