Squirrels and other critters love the taste of tulip bulbs and go to great lengths to dig them up. Gardeners have devised a number of creative ways to foil the varmints, from sprinkling cayenne pepper on the soil to laying down sharp gravel as a mulch. The most successful way to keep digging animals from eating your bulbs is to block their access to the soil.
Measure the planting area to determine how much chicken wire you need. You will need enough chicken wire to completely cover the bed, plus 1 foot on all sides.
Dig a 1-foot-deep trench around the entire planting bed. Lay the chicken wire over the bed and bend the edges down so they are hanging into the trench. The tulips will grow through the holes in the wire.
Fill the trenches with soil and walk over them to pack the soil. Lay bricks or heavy rocks around over the filled-in trenches.