Hamsters are natural burrowers and runners who require enrichment far beyond what is typically provided to express normal behavior.
The welfare gap between what hamsters need and what they typically receive in pet care is one of the largest in the companion animal world. A hamster in a standard pet store cage with a 6-inch wheel on a plastic floor has approximately the same relationship to its needs as a person kept in a closet for life. The welfare problems are predictable, documented, and entirely preventable with appropriate housing.