Things You'll Need
Instructions
Float eye-spot balloons close to the egrets. Eye-spot balloons are designed to be threatening to birds and animals, and if the birds are unsettled enough, they will leave. Move the balloons around daily to prevent the egrets from becoming accustomed to them.
Tie strips of highly-reflective Mylar to the branches of the trees where the egrets are considering settling. The light bouncing off the Mylar strips startles the birds into taking off.
Hang up plastic owls or hawks in the affected trees. These fake predators startle the egrets, causing them to feel insecure. Move the models regularly to ensure that the birds do not get used to them.
Set off rope firecrackers if your local ordinances allow for them. Sharp sudden noises when the birds are roosting startle them badly.