Why do pigeons keep coming back to the same ledge?
Pigeons return to a ledge because it offers a flat, dry, sheltered place to rest, and birds that have used it before tend to come back. Cleaning the surface and fitting a deterrent removes the reason; shooing the birds only moves them for an hour.
A ledge under a cornice or beside a window ticks every box: it stays out of the rain, it is hard to reach from the street and it is often warm from the building below. Droppings left in place can act as a marker, so a ledge that has only been scared and never cleaned is likely to be reused.
This is also why one tenant fitting a deterrent can send the birds to the next window along. If several windows on a line have the same problem, treating all of them at once gives the birds nowhere to go.
Who is responsible for pigeons on a fire escape or roof?
In a multiple dwelling, the fire escape, roof, cornice and facade generally belong to the owner or the co-op or condo board, while a window ledge or air-conditioner sleeve may be yours. Report it in writing to the managing agent and keep a copy; call 311 if it is not dealt with.
The 1901 New Tenement Law is one reason older walk-ups have fire escapes at all, and those escapes are now a common perch. Because they are part of the building's means of egress, nothing should be fixed to one without the owner's agreement, and the technician will not leave anything that blocks the path out.
If your building sits in a designated historic district, it is sensible to ask the owner or board before anything is fixed to a facade. Our guide to landlord and tenant pest responsibility sets out who normally handles what in a New York building.
Is it safe to clean up pigeon droppings myself?
Light, damp cleanup of a small area is something many people do, but heavy or dry droppings are better left to a technician. Dried droppings can put dust into the air, which is a respiratory concern for some people, so wear a mask and gloves and never sweep dry droppings.
On a fire escape or high ledge, the bigger risk is the fall. A technician brings the right gear for height, bags the waste for disposal and cleans the surface so a deterrent will hold.
People with asthma, a weakened immune system or a baby in the flat should keep away from the area until it has been cleaned. If you are unsure, call and describe what you see.
Do bird deterrents hurt the birds?
Standard spikes, slopes, wire and netting are physical deterrents designed to stop birds landing, not to injure them. Netting must be fitted tight and checked, because a loose net can trap a bird. Tell the technician if a ledge is also used by other birds you want to keep.
Poisons and traps are not part of the ordinary toolkit for building ledges. The aim is to make the spot awkward to use, so the birds roost somewhere that is not your windowsill.
How long do bird deterrents last?
Well-fitted spikes, slopes, wire and netting can last for years, but they need to be inspected and cleaned, since debris can build up and give birds a landing spot again. The technician will tell you what to check and how often, and the report records what was fitted and where.
Weather, sun and the surface they are fixed to all matter. A deterrent fixed to crumbling mortar or flaking paint will not hold, so some surfaces need repair first, and that is a job for the owner or a builder.
If birds move to a neighbouring ledge, the sensible answer is to extend the treatment along the line, not to add more material in the same place. The technician will tell you if that is what is happening.