hawks, tawny owls, buzzards alltake heads off sparrh worst Ihad some success by leaving a transistor radio playing
quietly keeps foxy away as well if you have elect,, fence try putting a floresence light with one end touching wire other
end touching ground (smallest tube) flickers when there is a pulse from the unit good for night time invaders if you
have a serious problem then you have a decision to make simple as that !!