Blue Whales Eat Up to Four Tons of Krill a Day

Only three bat species drink blood, and vampire bats can die if they go about two nights without a meal.

A panda can eat roughly 12 to 38 kilograms of bamboo a day, since the plant provides little nutrition.

The leaves are toxic and low in energy, so koalas sleep up to 20 hours a day to conserve energy.

Large studies have tied a diet rich in olive oil, vegetables, fish and whole grains to fewer heart attacks and strokes.