A model of a cat may intimidate birds. A real cat would be even better.
Set up a fake owl or bird of prey, and a large cardboard silhouette in a big window, or keep a cat in the garden
No I am not I like birds.
put some bird seeds away from your patio.
Unless the birds are causing harm to the balcony let them nest there. If their staying there is undesired wait until babies are hatched and gone then remove the nest and block where they are nesting.
rat poisen or bb gun or if you want to keep them alive smoke them out
Fishing line is not a humane way to keep birds away from areas a person would like to restrict. The fishing line can kill the bird.
Take away any food
Check the local hardware store for a plastic owl. This will keep birds away. No poison too.
If they are wild birds, keep the dog food INSIDE. they should not bother the pool, though.
12 gauge shotgun? Or less lethally, stay away from them? lol
to use for a home for the eggs and to keep away from predators
Farmers and any home gardener who has problems with birds may use scarecrows to keep birds away from the crops.
They do it to keep warm while migrating or coming back from migration; also to stay away from predators.
Most eagles do, there may be some excuses for trained eagles.
Tinting the glass won't help, but you can get hawk silouette decals to stick on, and that will usually keep birds away.