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ChemicalUrban Pest Birds & Bats

Chemical Bird & Bat Control: Why Poison Isn't Legal Here

TL;DR

Chemicals are the wrong tool for this pest group, and for most species they're the illegal one. The federal Migratory Bird Treaty Act protects over 1,000 native bird species, and every bat species in New Hampshire is protected by state law — you cannot legally poison either. Only feral pigeons, European starlings, and house sparrows are unprotected, and even those are managed with exclusion and deterrents, not avicides. Real bird and bat control is physical: netting, spikes, one-way exclusion, and sealing, done by a licensed wildlife professional on the correct legal timeline.

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NH License #782664Family-owned since 2017Updated Jul 2026

  • Federally protected species

    Over 1,000 native bird species under the Migratory Bird Treaty Act

    U.S. Fish & Wildlife Service; All About Birds.

  • Unprotected birds

    Feral pigeon, European starling, house sparrow — the only 3

    USFWS; All About Birds.

  • Bat protection in NH

    All bat species are protected under state law

    NH Fish & Game.

  • Legal bat exclusion window

    Roughly mid-August to mid-May; NOT mid-May–Aug 1 (maternity season)

    NH Fish & Game; UNH Extension; PCT.

The honest verdict

Does this actually work?

LOW/inappropriate for any chemical population-control approach — it's illegal for protected species and doesn't work well even where legal; exclusion and deterrents, done by a licensed wildlife professional, are the correct and effective method.

Low — Rarely Works

Evidence: The Migratory Bird Treaty Act protects over 1,000 native species, and NH Fish & Game protects all bat species statewide — poisoning either is illegal. Even for the three unprotected pest birds, industry and extension guidance point to netting, spikes, and habitat modification rather than avicides, which are not part of the standard urban-bird-control toolkit.

Works when

  • Physical exclusion (netting, spikes, one-way excluders) replaces any chemical approach
  • Bat exclusion happens strictly within the legal window (roughly mid-August to mid-May)
  • A licensed wildlife control operator confirms species identification and legal status before any action
  • Guano cleanup uses an EPA-registered disinfectant with proper respiratory PPE, not a pesticide aimed at the animals

Fails when

  • Anyone attempts to poison a bird or bat — illegal for protected species and ineffective/inhumane even for unprotected ones
  • Bat exclusion is attempted during the mid-May–August 1 maternity window, trapping flightless pups
  • A structure is sealed before confirming the colony or nest has fully vacated
  • Guano is dry-swept or vacuumed without respiratory protection, risking histoplasmosis exposure
At a glance

There's no legal spray for this problem

How it works

Pro-only

There is no legal population-control chemistry for this category. Control is physical exclusion — netting, spikes, and one-way devices deny birds and bats access to roosting and nesting sites, and sealing closes the gap permanently once the animals have left. The only chemistry that legitimately belongs on this page is an EPA-registered disinfectant used to safely clean up guano after exclusion, not any product aimed at the birds or bats themselves.

Vital stats

Time
Seasonal for bats — tied to the legal exclusion window; ongoing deterrence for pest birds
Best for
Deterring the three unprotected pest birds (pigeon, starling, house sparrow) from roosting/nesting sites, and legally, safely excluding bat colonies from structures outside the maternity season.
Cost
free inspection / same-day service — this is a licensed wildlife-control job, not a DIY chemical purchase

For most pest categories on this site, the chemical page is about which product class to use. For birds and bats, the honest answer is different: there usually isn't one. The Migratory Bird Treaty Act protects the vast majority of species you'll find nesting on a New Hampshire roofline — more than 1,000 native species under federal law (USFWS) — and New Hampshire Fish & Game protects every bat species in the state. Poisoning either is illegal, and for bats it's also cruel and ineffective given how they roost in inaccessible voids.

Only three birds fall outside federal protection: feral pigeons, European starlings, and house sparrows. Even for those, the professional standard isn't an avicide — it's netting, spikes, and habitat modification. Bats are handled exclusively through timed, one-way exclusion outside the maternity season. This page explains what the law actually allows, why chemistry barely applies, and when to bring in a licensed wildlife control operator instead of reaching for a product that doesn't exist for this job.

Step by step

How to do it

  1. Identify the species before doing anything

    Confirm whether the bird or bat you're dealing with is a protected native species/bat, or one of the three unprotected birds (pigeon, starling, house sparrow). This determines what's legally allowed next.

    Caution: Guessing wrong and removing a protected nest or attempting lethal control is a federal or state violation.

  2. Inspect for entry points and roost signs

    Look for staining, droppings, gnaw marks at gaps, and active roosting or nesting activity at eaves, soffits, chimneys, and vents.

    Tip: Evening watches near dusk reveal bat entry points as the colony emerges to feed.

  3. For bats: wait for the legal exclusion window

    Bat exclusion is only appropriate roughly mid-August through mid-May, after pups born that season can fly and leave with the colony.

    Caution: Never exclude bats mid-May through August 1 — pups too young to fly will be sealed in or separated from the colony.

  4. Install one-way excluders, then confirm the space is empty

    One-way devices let bats leave to feed but not return. Confirm no activity remains before sealing.

    Tip: A licensed operator typically monitors for several nights before final sealing.

  5. Seal all gaps — bats fit through 3/8-inch openings

    Once confirmed empty, permanently seal every entry point with appropriate materials; for pest birds, install netting or spikes on ledges and roost sites instead of sealing gaps.

    Caution: A gap you'd consider too small to matter is often exactly the size a bat can use.

  6. Clean guano with proper respiratory protection

    Wet down accumulated guano before removal to limit dust, wear an N95 or better respirator and gloves, and use an EPA-registered disinfectant on affected surfaces afterward.

    Caution: Dry sweeping or vacuuming guano risks inhaling Histoplasma spores.

What you need

Tools & materials

  • One-way bat excluders/cones

    Let a bat colony leave a roost without being able to re-enter

    Timing and placement matter — this is best left to a licensed operator

  • Bird netting and spikes

    Physically deny pigeons, starlings, and house sparrows access to ledges and roosts

    Legal for the three unprotected species

  • Sealant and exclusion materials

    Permanently close confirmed-empty entry points

    Only after confirming bats/nests have vacated

  • N95+ respirator and gloves

    Protect against histoplasmosis during guano cleanup

    Essential for any enclosed attic guano accumulation

  • EPA-registered disinfectant

    Safe post-exclusion cleanup of guano-contaminated surfaces

    The only chemical product genuinely relevant to this page

Products & actives

What to use — the label is the law

Product classes only — never a dosage. Always read and follow the product label.

EPA-registered disinfectant/cleaner

Active class: Varies by product; check EPA registration number

Post-exclusion cleanup of guano-contaminated surfaces only — not for treating birds or bats

Read and follow the label — the label is the law; ventilate and wear respiratory protection during use

Stay safe

Safety first

  • General

    High risk

    Bat guano can harbor Histoplasma, causing histoplasmosis when inhaled during dry cleanup; always wet-clean or use proper respiratory PPE (UNH Extension).

  • General

    Severe

    Bats carry a rabies risk; never handle one bare-handed. A bat found in a room with a sleeping person or child should be safely contained and evaluated for rabies rather than released (NH Fish & Game).

  • Children

    Caution

    Keep children away from active roosts, guano accumulations, and any exclusion work in progress.

  • Pets

    Caution

    Keep pets away from guano and from investigating grounded or injured bats/birds.

  • Applicator

    High risk

    Respiratory protection (N95 or better) is required for any guano cleanup; wildlife-control operators should also follow standard bite/scratch precautions when handling bats.

Avoid these

Common mistakes

Why this method fails in practice.

  • Attempting to poison birds or bats — illegal for protected species, and there's no legal avicide product for this category

  • Excluding bats during the mid-May–August 1 maternity season, trapping flightless pups

  • Removing a native bird's active nest or eggs without a permit

  • Sealing a structure before confirming the colony has fully vacated

  • Sweeping or vacuuming guano dry instead of wet-cleaning with respiratory protection

New Hampshire context

Bird and bat law in New Hampshire

This category is governed by wildlife law, not the pesticide program that covers most of this site's chemical pages. NH Fish & Game protects all bat species statewide, and the federal Migratory Bird Treaty Act covers the great majority of birds you'd encounter nesting on a NH home. The legal bat-exclusion window runs roughly mid-August through mid-May; excluding bats between mid-May and August 1 — when flightless pups can't leave with the colony — is prohibited because it seals pups inside to die or forces them into living spaces. New Hampshire's bat populations have also been hit hard by white-nose syndrome, with some hibernacula surveys showing declines of nearly 99% for certain species, which is one more reason lethal control isn't on the table even where it might once have been considered.

Killing protected birds or bats without a federal/state permit is illegal; NH Fish & Game and the USFWS, not NHDAMF's pesticide rules, are the controlling authorities here.

UNH Cooperative Extension echoes NH Fish & Game guidance: bat problems are solved with timed one-way exclusion and sealing, never chemicals.

This method targets

Pests this applies to

When to call a pro

Bird Control / Wildlife with Anchor

This category is licensed-wildlife-control territory more than pest-control territory. Anchor's team handles species identification, timing the legal exclusion window correctly, physical exclusion, and safe guano cleanup — the things that actually solve a bird or bat problem, since chemistry isn't a legal or effective option here.

Call us when…

  • A bat colony is roosting in your attic or wall void
  • You see droppings, staining, or nesting activity from pigeons, starlings, or house sparrows
  • A native, protected bird has built an active nest somewhere problematic
  • You need guano cleanup in an enclosed space
  • You found a bat inside near someone who was sleeping

Bird Control / Wildlife

free inspection; same-day service across southern and central New Hampshire.

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Keep them out

  • Cap chimneys and screen vents and soffits before bats or birds find them
  • Install deterrents (spikes, netting) on ledges favored by pigeons and starlings
  • Seal gaps 3/8 inch or larger, but only after confirming no active roost or nest is present
Common questions

Frequently asked

Sources & further reading(5)
  1. [1]
    U.S. Fish & Wildlife Service / Federal Register — Migratory Bird Treaty Act Regulations

    MBTA scope and protected-species framework

    govverified 2026-07-13
  2. [2]
    All About Birds (Cornell Lab) — What Is the Migratory Bird Treaty Act?

    Over 1,000 protected species; feral pigeon/starling/house sparrow as the unprotected exceptions

    encyclopediaverified 2026-07-13
  3. [3]
    NH Fish & Game — Homeowners and Bats

    All NH bats protected; exclusion timing; found-a-bat guidance; bat population decline data

    govverified 2026-07-13
  4. [4]
    UNH Cooperative Extension — Bats in New Hampshire

    Maternity-season exclusion prohibition; sealing entry points; guano/histoplasmosis caution

    extensionverified 2026-07-13
  5. [5]
    PCT — When Is the Right Time for Bat Exclusion?

    Legal exclusion window summary and one-way excluder method

    industryverified 2026-07-13

Written & reviewed by

Verified

Daniel Brady

NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)

Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.

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Anchor Pest Services

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