In total there is said to be around 400 million dogs in the world.

An elephant's trunk can grow to be about 2 metres long and can weigh up to 140 kg. Some scientists believe that an elephant's trunk is made up of 100,000 muscles, but no bones.

While butterflies sip nectar from flowers, they also sip any urine that has collected on the flowers and leaves any chance they get. Urine is a butterfly's best source of vitamins.

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