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13|| During those two months, the mother will travel up to 50 miles each way to hunt, and will return to their newly-hatched chick with a belly full of food to regurgitate.

12|| Male emperor penguins will stand without eating for up to two months in the Antarctic elements while the female goes to feed.

11|| A cheetah can go from zero to 60 miles per hour in three seconds.

10|| The snapping shrimp is the loudest known living creature. It has specialized claws that shoot jets of water at up to 62 miles per hour and leaving a trail of bubbles that explode at 200 decibels —

9|| Blue whales are the loudest mammals, producing low-frequency "pulses" that can be heard from more than 500 miles away.

8|| The howler monkey is the loudest land animal. Its call can be heard from three miles away.

7|| The water boatman can make a 105-decibel noise by rubbing its penis against its belly.

6|| Oysters can change gender multiple times during their life.

5|| A beaver's teeth never stop growing. It needs to chew on tree trunks and branches to keep them from getting too long.

4|| Fleas can jump distances 100 times their body length.

3|| Houseflies hum in the key of F.

2|| The blue whale's tongue weighs as much as an adult elephant.

A chameleon's tongue can be as long as its body.

1 ✓ The construction of the Eiffel Tower began on 26 January 1887 and took 2 years, 2 months and 5 days to complete. 2 ✓ In the construction of the 300-meter tower, 7.300 tons of steel and 18.038 tons