A guy who raises cattle told me they will literally eat the eyes and tongue of a newborn calf as its being born. They have to keep very vigilant during birthing season.you are entirely correct chikenwing, buzzards will kill new-born calves, if their mother isn't there to get them off it. i've had a good many buzzards flying above the house last fall, [ during deer season, i live in rural MS] but they never offered to bother my chickens in the yard. i have wondered this same thing myself,, hope for a knowledgeable reply to this.