Although most species of shark are less than one metre long, there are some species such as the whale shark, which can be 14 metres long.

You can tell the age of a whale by looking at the wax plug in its ear. This plug in the ear has a pattern of layers when cut lengthwise that scientists can count to estimate the age of the whale.

People from the United States eat the most chicken per person than anywhere else in the world.

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