The common pond frog is ready to breed when it is only three years old.

Beluga whales which are also called "white whales" are not born white. They are born grey in color, and by the age of six become completely white.

There was a post office on the Russian space station Mir. Visiting cosmonauts would use unique postal "markers" to stamp envelopes and other items as having flown aboard the Mir space station.

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