That depends what of the hippopotamus you are trying to measure. A hippopotamus is a pretty large thing, so to weigh the hippopotamus, you would probably use a unit like pounds (or maybe even tons), kilograms, etc. The length of a hippopotamus could be easily measured in feet, metres, or centimetres.
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feet
a centimeter
In the US, I would use yards.
Miligram
millimetres.
the unit of measurement for destiny
The SI unit for mass measurement is the kilogram (kg).
I would use feet.
feet
Feet.
a centimeter
Centimetres.
A gram.
A shoe.
I would use litres.
In the US, I would use yards.
You would use the measurement of "miles".