The November 26, 2005 issue of BMJ describes a drug-free treatment for depression which, were one to judge solely by the lead sentence, sounds startlingly simple:
Dolphins can help alleviate symptoms of depression after two weeks of treatment.
That issue of BMJ includes a detailed study written the experimenters, Christian Antonioli and Michael A Reveley. The dolphin duo is based at the University of Leicester Medical School.
[NOTE: This study appears to be another good candidate for the Gillinov standard.]