Moles are especially fond of earthworms, unfortunately. And when a mole happens upon more earthworms than it can consume at the moment, it stores them in a cache. The mole will bite off an earthworm's head, twist it into a knot and push it into a cavity in the soil. A single mole can store several thousand earthworms this way. Even if it doesn't eat all the worms, there is no waste.
Earthworms regenerate at the head, so they grow a whole new body and wiggle away.
It is the mole's constant need for food that drives it to drill through even the most compacted soils. A muscular cylindrical body equipped with oversized front feet that look like clawed paddles allows the mole to scrape through the earth in a swimming-like motion. Forefeet push the soil against the side of a tunnel and compact it. Back feet grip the tunnel wall for leverage. In good soil, moles can travel up to 30 yards an hour and will easily do 50-plus when in rut.