How do pikas and voles prepare for winter in alpine habitats?

In alpine habitats, both pikas and voles prepare for the harsh winter months by caching hay in the fall to serve as a food source during the winter season.1

Pikas, which do not hibernate, are particularly known for this behavior. Rock-dwelling pikas make repeated trips to meadows near their talus habitats to harvest vegetation, which they carry directly to their caches, or haypiles, to ensure they have provisions available when snow blankets their environment. Similarly, voles, which remain active year-round, utilize these cached resources to survive the winter, often traveling through tunnels beneath the snow to access food or move safely through their environment.123