Penguin Palpitations

News that Humboldt penguins at Scarborough zoo are being given antidepressants to help them cope with the current UK weather (http://www.theguardian.com/world/the-northerner/2014/feb/06/penguins-prescribed-antidepressants-scarborough-rain) is itself depressing. It would probably have been better to give them improved lighting (with UV) if it was actually thought they had developed SAD (seasonally associated depression.