Are they after worms or something like that in
your lawn????
Possible after grubs that are close to the surface????

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Weezie

Don't forget to be kind to strangers. For some who have
done this have entertained angels without realizing it.
- Bible - Hebrews 13:2





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Hi Forrest
Is your lawn brown by any chance?

If so this could be the problem!
Crows are going for the delicacies living there, like Weezie said, but maybe the grubs are not the problem after all(most soils have them), but it is more likely that your soil is out of balance, and that can be caused by many things, including over-watering or over-fertilizing, using a weed and feed product,compacted soil,etc. If any one of these applies to your lawn, then its time to overhaul your lawn care regimen.
In order to return your soil's health, use only natural products on your lawn. Around early May,apply an even layer of well-rotted compost to you lawn. It should be enough so you still see your grass (don't leave any clumps or you'll block the light and have dead spots) and water it well. This first step in starting a natural lawn care regimen will amaze you. The compost will feed the roots of your grass plants, and as they get healthier, earthworms and microbes will return to the soil. The healthier roots will move down lower into the soil and will withstand drought, and your grass won't grow as fast.
Hope this helps!!

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"Knowledge speaks, but wisdom listens".