What If Gone

Species → European Hamster

European Hamster

Cricetus cricetus

No precise global figure; range down 94% in France since 1972 and by…
Extinction risk Critically Endangered
Ecosystem engineerAgriculturalNear-extinctionCatastrophic decline
European Hamster (Cricetus cricetus)
Photo: Charles J. Sharp, Wikimedia Commons (CC BY-SA 4.0)

What if it disappeared?

Impact Moderate
Over 77 years, Alsace

The hamster's body mass at emergence from hibernation fell by 21% in under a century, driven by the combined rise of maize monoculture and a 28% increase in winter rainfall — litter size in France dropped from 5-8 pups to just 2.4, and litter frequency from 2-3 a year to less than one.

Documented
Detail

Tissier, M.L., Handrich, Y., Robin, J.-P., Weitten, M., Pevet, P., Kourkgy, C. et Habold, C. (2016). How maize monoculture and increasing winter rainfall have brought the hibernating European hamster to the verge of extinction. Scientific Reports, 6, 25531.

A female needs a minimum weight of 200 g to be fertile after her first winter; in 2013, some females emerged at only about 186 g on average, below that threshold. Maize acreage has grown 57% since 1989 — a low-protein, late-harvested monoculture that leaves the hamster less time and fewer resources to fatten up before winter.

Since 1972

The European hamster's range has shrunk by 94% in France since 1972 and by more than 75% in Ukraine and Russia — a decline judged rapid enough by the IUCN to justify a critically endangered listing and a warning of possible extinction within thirty years without action.

Documented
Detail

UICN, Liste rouge — Cricetus cricetus (évaluation dirigée notamment par Mikhail Rusin, zoo de Kiev).

Reintroduction programs are already underway, such as the release of 11 captive-bred hamsters in Ukraine's Khotyn National Park — a scale still tiny compared with the extent of the decline documented across the continent.

Not measured to date

The European hamster is considered an ecosystem engineer through its deep burrows, but no study has measured what this digging activity contributes to farmland soil, or what would be lost with its disappearance — most available research covers the causes of its decline, not its ecological role.

Insufficient

Documentation

Last verified: August 14, 2026