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Hi, Clara: As you surmise,Hi, Clara: As you surmise, this could be any number of things, from worms to mice/rats/squirrels to deer. Assuming that you have looked for tracks from the bigger critters and found none, you might also consider other suspects: birds, such as sparrows and finches. If it's possible in your garden, identify some still good plants where you can carefully smooth the soil. Sprinkle a dusting of powder or flour and just see if any tracks show up, just to check. At the same time, set yourself up a little scarecrow and be prepared to use some hardware mesh or perhaps bird netting, as the case may be. If necessary, you need to bury your mesh or old screening at least 6 inches deep, but hopefully some anti-air-craftiness will prove simpler, cheaper, and just as effective.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?