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Hummingbirds can fly backward

Hummingbirds are the only birds that can sustain controlled backward flight.

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A hummingbird can rotate each wing through a wide arc and generate lift during both halves of the wingbeat. That unusual motion also lets it hover and move sideways.

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Octopuses have three hearts

An octopus has three hearts and blue blood that uses copper-rich hemocyanin to carry oxygen.

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Wombats make cube-shaped droppings

Wombats are known for producing cube-shaped droppings, a form created inside the final part of the intestine.

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The blue whale is the largest animal ever

Blue whales are the largest animals ever to live on Earth, and the biggest may eat up to 6 tons of krill a day.

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