I had a hamster, and I loved my dear Smedley (who died when we had our fire), but this made me laugh.
Depressed Hamsters Shed Light on Seasonal Disorder.
Depressed Hamster Behavior
For example, if the animals spend more time hovering near the walls of their containers, rather than at the center, it’s believed they feel more anxious. If they decline to slurp up tempting offers of sugar water, scientists take it as a sign of depression. Another test involves placing the animals in water and seeing if they swim or simply give up and float. Hamsters don’t sink apparently, but float in water.
“The sooner they give up in the water, the more depressed they are,” Pyter said. “If you give them an antidepressant they don’t give up as quickly.”