• Starfish
    Starfish can re-grow their arms. In fact, a single arm can regenerate a whole body.Reuters
  • Mimic Octopus
    The Mimic Octopus has the ability to change its body colour as well as shape. It can take the shape of other animals, such as the flounder, lionfish and sea snakes.Reuters
  • Caterpillars
    Caterpillars completely melt as they transform into moths.Reuters
  • Lion
    If a male lion takes over a pride, he executes all of the cubs.Reuters
  • Hummingbird
    A hummingbird weighs less than a penny.Reuters
  • Woolly Mammoth
    The Woolly Mammoth was around when the Egyptian Pyramids were being built.Creative Commons
  • Two-headed Snake
    When two-headed snakes are born, they fight with each other for food.Reuters
  • Shark
    A Shark can detect one particle of blood in 100 million particles of water.Reuters
  • Jellyfish
    A jellyfish is 95 percent of water.Reuters
  • Hippo
    A Hippo can open its mouth wide enough to fit a 4 feet tall child inside.Reuters
  • Cockroach
    A cockroach can live several weeks with its head cut-off.Reuters
  • Pug
    A group of pugs is called a Grumble.Reuters
  • Lobster
    Frozen lobsters can come back to life when thawed.Reuters
  • Ostrich
    An Ostrich's eye is bigger than its brain.Reuters
  • Dog
    Dogs are capable of understanding up to 250 words and gestures. They have also demonstrated the ability to do simple mathematical calculations.Reuters

World is full of surprises and there are many interesting facts around us that most of us are not aware of. For example – You are one percent shorter in the evening than in the morning or the strongest muscle in a human body is Tongue.

Such interesting facts can also be found in animals. Apparently one does not know how many kinds or species of beautiful creatures we have on earth and the amusing facts surrounding them.

From 'caterpillars' to 'octopus', there are many surprising as well as interesting facts about animals as compiled by All that is Interesting that will boggle your mind.

Check out the above slideshow of 15 unknown and interesting facts about animals.