Predators such as owls and hawks are opportunists and will take turkey poults when the opportunity arises...

Red tailed hawks in particular probably take the greatest toll...I doubt a red tail could kill a full grown turkey, but they get thier share of the poults when the mothers have them out in the hayfields eating bugs.... I once saw a red tail hit an adult hen turkey...Didn't kill her, but she was one PO'D turkey..!!....