You would typically use grams (g) to measure the mass of a hamster.

Here's why:

* Small Size: Hamsters are small animals, and grams are a convenient unit for measuring their relatively low weight.

* Precision: While you could use kilograms, it would result in very small decimal values. Grams provide a more precise and manageable measurement for a hamster's mass.

Let me know if you have any other questions!