Calculate the number of cells in a hummingbird assuming it weighs 10-2 kg

A popular assumption is that the mass of a cell s 10 times the mass of a bacterium, which is about 10⁻¹² g.
Therefore, one cell of the humming bird has a mass of about 10⁻¹¹ g.

The number of cells in a hummingbird weighing 10⁻² g is
10⁻²/10⁻¹¹ = 10⁹

10⁹ or a billion.

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