Before refrigerators, Russians and Finns would put live brown frogs in their milk to keep it from spoiling. – WTF Fun Facts
Source: http://discovermagazine.com/2014/may/27-milking-frog-skin
WTF Fun Fact – Frogs In Milk

Before refrigerators, Russians and Finns would put live brown frogs in their milk to keep it from spoiling. – WTF Fun Facts
Source: http://discovermagazine.com/2014/may/27-milking-frog-skin