Wild Bird Feeders + Chickens = 100% Worms??

[HandLoad]

We have our First Flock of Eight - Just beginning to let them run the Yard. They Found the Detritus beneath the Wild Bird Feeder Today, before I could Shoo them away. Probably all Eight were feeding there. Am I pretty certain to get Wormy Chickens? This is in the Glorious NorthBest, and the Chickens are Just 12 Weeks Old.

Hoping for "Free-Range" but Wife cannot Give Up Wild Bird Feeder, due to All the Fauna who are supported by it.

How to Diagnose Worms, and How to Dose, With What? Eggs are only 6 to 10 Weeks away!

Thanks for the Replies.