Have you considered the angle in which the bottle is actually mounted? Perhaps differences could confuse them enough to keep them in there. Maybe try angling it at a steep downward slope with the entrance at the bottom.
Alshain said:Have you considered the angle in which the bottle is actually mounted? Perhaps differences could confuse them enough to keep them in there. Maybe try angling it at a steep downward slope with the entrance at the bottom.
coldmachineUK said:I'm being obvious I know but can't you just try using duel netting?