"Next, she dosed the animals with ecstasy. Again, there’s no…

"Next, she dosed the animals with ecstasy. Again, there’s no precedent for this, but researchers often anesthetize octopuses by dunking them in ethanol—a humane procedure with no lasting side effects. So Dölen and Edsinger submerged their octopuses in an MDMA solution, allowing them to absorb the drug through their gills. At first they used too high a dose, and the animals “freaked out and did all these color changes,” Dölen says. But once the team found a more suitable dose, the animals behaved more calmly—and more sociably."

https://getpocket.com/explore/item/what-ecstasy-does-to-octopuses?utm_source=pocket-newtab