Shade and a sheltered ledge
Birds look for a flat, stable surface with shade from midday heat and shelter from coastal wind. The covered top of an outdoor AC unit, the corner behind a railing and the gap between the unit and the wall all offer exactly that combination.
The quieter and less disturbed the spot, the more likely birds are to nest or roost daily. That is why the problem often shows up on rarely used balconies, or ones where stored items stay untouched for weeks.
Signs the spot has become a regular roost
- Droppings piled in one place, some old and dry, some fresh.
- Small feathers, twigs and threads collected behind the unit or on a shelf.
- Cooing or early-morning movement at the same ledge.
- White streaks running down the outer wall or onto the balcony below.
