Squirrels and other little furry creatures absolutely love bulbs and will sniff them out in a heartbeat. Here is a potential solution, provided you can get the raw material, Crushed oyster shells, according to the Oct./Nov. '08 issue of Horticulture Magazine, is a very effective deterrent. Just sprinkle them below and then above the bulbs as you plant. Chipmunks, squirrels, voles, and other animals don't like the feeling of the shell shards and steer clear. This tip came from Tovah Martin, a regular contributor to the magazine.
Where to get them? The article suggests the grain store. We can probably hit up the local seafood store or restaurant for a bag of shells to crush. This simple solution may ensure you keep your bulb investment from becoming squirrel snacks.