See my follow up comment about the Nuremberg zoo. There it's on record they regularly use diazepam (in way too high doses even on pregnant dolphins) and synthet

See my follow up comment about the Nuremberg zoo. There it's on record they regularly use diazepam (in way too high doses even on pregnant dolphins) and synthetic progestogen to deal with the anti-social behavior of males, quite regularly. The director himself doesn't even deny it, claiming it's good for the animal's appetite, which is normally considered a side-effect (from the süddeutsche article) Keep in mind that this is the very same director (he's director of the Nuremberg Zoo, Berlin doesn't have any dolphins) who demanded a dolphin breeding program gets started in Nuremberg to attract more visitors, even tho nobody on the staff had any experience with something like that. [0] The very same director who thinks staff shouldn't intervene when dolphins attack each other because "that wouldn't happen in nature" [0], never mind that in nature these animals have quite a bit more room to evade each other than a somewhat bigger swimming pool. [0] http://www.zeit.de/2015/04/delfine-tierschutz-delfinarium-nuernberg/seite-2 http://www.zeit.de/2015/04/delfine-tierschutz-delfinarium-nu...