Guidelines to avoid harm to migratory birds

Information on the risk your activities might pose to migratory birds, and guidelines to avoid causing harm to migratory birds, as well as to their nests when they are protected.



This information provides an overview of your obligations and does not replace relevant laws and regulations. You must adhere to all federal, provincial and/or territorial laws, regulations and conditions of permits.

We do not have the authority to prescribe or recognize specific avoidance or mitigation measures for specific circumstances or activities. It is your responsibility to determine the most appropriate avoidance or mitigation measures required.

Please contact us for further information.

Migratory birds, their nests or eggs can be harmed as a result of many activities. Activities that do not primarily target a bird, but which may cause harm, include:

Causing harm to migratory birds can have long-term negative effects on bird populations. This is especially true if there are many incidents that harm birds.

We work with the public, governments and industries to help:

Your role and responsibilities

To prevent harming migratory birds, nests and eggs, you should:

Prohibitions on causing harm to migratory birds, their eggs and nests

The MBR 2022 protect migratory birds, their eggs and their nests, by prohibiting activities that can cause them harm.
Unless a person has a permit, or the regulations authorize them to do so, they are prohibited from doing the following activities:

The nests of species listed in Schedule 1 are protected at all times, unless the following conditions are met:

The following is a list of the 18 species whose nests are protected year round as well as the designated waiting period before the nest can be disturbed, damaged, removed or destroyed
Species of migratory bird Waiting Period (months) Species of migratory bird Waiting Period (months)
Pigeon Guillemot 12 Cassin`s Auklet 12
Rhinoceros Auklet 12 Ancient Murrelet 12
Atlantic Puffin 12 Great Blue Heron 24
Tufted Puffin 12 Great Egret 24
Horned Puffin 12 Cattle Egret 24
Manx Shearwater 12 Green Heron 24
Northern Gannet 12 Snowy Egret 24
Fork-tailed Storm Petrel 12 Black-crowned Night Heron 24
Leach’s Storm Petrel 12 Pileated Woodpecker 36

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Determining the risk to migratory birds

When planning your activities, you should assess the risk your activity might pose to migratory birds, and take measures to avoid this risk.

Key factors associated with higher risk to birds include:

In the case of bird collisions with structures, higher risk factors include:

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Determining the presence of occupied nests

The nests of all species of migratory birds are protected when they are occupied, that is they contain a live migratory bird or viable egg (so generally during the breeding season). When determining if occupied migratory birds nests are likely to be present, you must consider:

For example, “point counts” (a technique to locate singing territorial males) may provide a good indication of the possible presence of songbirds nesting in an area.

In most cases, active nest search techniques are not recommended, because:

Nest surveys to determine nest occupancy may be appropriate when all these conditions are met:

Please contact us for further technical information about investigation methods for non-song bird species (notably, waterfowl, waterbirds and shorebirds).

Detection of an occupied migratory bird’s nest

If you discover or realize that you have disturbed a nest containing a migratory bird or eggs, you should:

If there are occupied migratory bird nests where you plan to work, activities that could disturb or destroy nests should be avoided, adapted, rescheduled or relocated. The best way to avoid disturbing or destroying active nests is to avoid conducting harmful activities during the breeding season.

Establishing buffer zones and setback distances

Any occupied nest found  should be protected with a buffer zone until the young have permanently left the vicinity of the nest.
It is not recommended to mark nests using flagging tape or similar material. This may increase the risk of predators finding the nest. If necessary, flagging tape can be placed at the limits of the buffer zone.

buffer zone is determined by a setback distance which varies greatly according to:

Appropriate setback distances are determined on a case-by-case basis based on:

There are two benchmark measurements to determine an effective setback distance.

Setback distances should be adjusted to the activities causing the greater amounts of disturbance. Significant sources of disturbance include:

A higher minimum setback distance is required in some circumstances:

For guidance regarding seabird and waterbird colonies, please refer to Guidelines to avoid disturbance to seabird and waterbird colonies in Canada.

Determining the presence of nests of Schedule 1 listed species

As well as looking for nest occupancy, those conducting nest surveys should also be looking for and recording the nests of Schedule 1 species (occupied or not occupied), so that they may plan ahead and exercise caution when they conduct their activity as not to disturb or destroy these nests at any time, as they are protected year round. The nests of many Schedule 1 species are conspicuous, such as heron and Pileated Woodpecker nests for Pileated Woodpecker cavity identification guide, or they occur in specific locations (coastal seabirds).

Destroying or removing an unoccupied migratory bird nest

The nests of most migratory bird species may be destroyed, damaged, disturbed or removed when they do not contain a migratory bird or viable egg.

For most migratory bird species, removing the nest when it does not contain a migratory bird or viable egg (generally after the breeding season) will have no effect on the ability of those birds to nest again. The great majority build or occupy new nests each year. However, some species may reuse the same nest structure year after year, and the loss of these nests could have a negative effect on future nesting success. The nests of the 18 species, listed in Schedule 1 of the MBR 2022, are protected year round and cannot be damaged, destroyed, removed or disturbed, even when they are unoccupied, unless the conditions of the regulations have been met.

ECCC encourages practices that will ensure the long-term conservation of migratory bird populations locally, including the retention of sufficient high quality habitat. For cavity nesting species, this may mean the retention of dying and dead standing trees in forest stands, whether or not they contain the nesting cavity of the Pileated Woodpecker.

Permits to relocate or destroy unoccupied nest of Schedule 1 species

In certain situations, it may be possible to obtain a permit to relocate or destroy the unoccupied nest of a Schedule 1 species. Please refer to Migratory Birds Permits for more information.

Managing exposed soil banks

When nests contain migratory birds or eggs (generally during the breeding season), it is important that you do not disturb these nests. You should take particular care when:

Regulating water levels

The management and maintenance of dams and project construction may require modifications to water levels in reservoirs, ponds or other wetlands.
When planning activities, you should:

Water level modifications may, for example, be scheduled prior to or after the breeding season.

Other regulatory protections

Remember that some provincial, territorial or other federal legislation may protect nests of some migratory bird species at all times. The nest of a migratory bird is included in the definition of “residence” for migratory bird species which are endangered, threatened or extirpated under the Species at Risk Act.

It is your responsibility to assess your legal obligations and to avoid harming migratory birds or their nests when they are protected.

Related links

Evaluate the risk you might pose to migratory birds

Determine the risk you might pose to migratory birds by reviewing the situations that might apply to you.

Table 1. Examples of lower and higher risk levels for the factor associated with planning of activities harmful to migratory birds in Canada
Factor associated with planning of activities Example of lower risk level Example of higher risk level
Knowledge of legal obligations Awareness of and understanding the relevant provisions of laws and regulations pertaining to the protection of birds, nests and eggs. Notably: the Migratory Birds Convention Act, 1994, the Migratory Birds Regulations, 2022 and, where applicable, the Species at Risk Act. Unaware of legal responsibilities towards the protection of birds, nests and eggs.
Risk assessment and planning Completed a thorough risk assessment in a timeframe suitable to balance project needs with risk of harm to migratory birds. Little to no pre-planning or risk assessment around conservation issues related to migratory birds.
Preventive and mitigation measures Measures are decided upon, implemented and monitored to avoid engaging in potentially destructive or disruptive activities at key locations or during key periods.
Records of decision and actions taken.
Measures such as policies, procedures, plans, directive or compensatory plan are incorporated into beneficial management practices.
Proponent and field operations staff are aware of the identified avoidance measures.
No specific measures planned and implemented to minimize the risk of detrimental effects and to help maintain sustainable populations of migratory birds.
No records of decisions and actions taken.
No beneficial management practices.
Ignorance or lack of training of field operation staff on avoidance measures.
Table 2. Examples of lower and higher risk levels for the factor associated with protection of nests.
Factor associated with protection of nests Example of lower risk level Example of higher risk level
Likelihood of the presence of occupied nests (live bird or viable egg) or nest of species in Schedule 1 When planning your project, you have identified:

  • available bird habitats
  • migratory bird species likely to be found in these habitats

time periods when migratory bird species are likely to be nesting, with nests containing migratory birds or viable eggsMethods used to prevent disturbance of nests are non-intrusive.

No understanding of local bird presence in space or time.
Active nest searches, except when the nests searched are known to be easy to locate without disturbing them.
Habitat Habitat where your activities will occur is small and simple, such as:

  • human-made structure (bridge, beacon, tower, and building)
  • man-made setting or those with few potential nesting spots or few species of migratory birds
  • urban park made mostly of lawns with few and isolated trees
  • vacant lot with sparse vegetation
Habitat is large and/or complex with many potential nesting areas, such as woodland and scrubland.
Nest type Presence of nests that are:

  • easy to find and avoid, such as nests of:
    • Great Blue Heron
    • Bank Swallow
    • Chimney Swift
  • easy-to-find cavity nests in snags, such as nests of:
    • woodpeckers
    • goldeneyes
    • nuthatches
  • nests of colonial-breeding species, such as terns or gull, that can be located from a distance
Presence of nest difficult to locate (in other words cryptic or small nests), such as nest of songbirds (this applies to nests of most species)
Timing Project occurs when nests do not contain live birds or viable eggs (so generally outside the nesting period) and won't affect nests that are reused in the following year(s) and are protected under Schedule 1 of the MBR 2022. Operations occur:

  • during the general nesting period, when they are likely to contain a live bird or viable egg
  • throughout the year and could affect nests that may be reused by migratory birds in the following year(s) and are protected under Schedule 1 of the MBR 2022 (such as nests of Great Blue Heron).
Table 3. Examples of lower and higher risk levels for the factor associated with disturbance of nesting birds.
Factor associated with disturbance of nests and nesting birds Example of lower risk level Example of higher risk level
Intensity of operation

Sources of low intensity disturbance are infrequent and quick

One or few sources of disturbance.

Low or below ambient noise in natural areas.

Sources of disturbance are either:
  • frequent
  • lasting
  • large

Several sources of disturbance.

Loud noise emissions, especially when:

  • exceeding 10 decibels (dB) above ambient in natural areas
  • greater than about 50 decibels (dB)
Landscape context Birds used to disturbance or already breeding successfully are present in the disturbed areas. Presence of birds intolerant to disturbance, such as:
  • birds moving away from their nest
  • agitated birds
  • birds performing distraction displays
  • birds actively defending the nest
Preventive and mitigation measures Disruptive activities around nest are halted.

Nest protected with effective/efficient buffer zone and/or setback distances.

Avoidance measures are put in place until the young have naturally and permanently left the vicinity of the nest.

No protection measures to reduce the effect of disturbance sources.

Ineffective/inefficient buffer or setback distance.

Table 4. Examples of lower and higher risk levels for the factor associated with birds at sea and fishing
Factor associated with birds at sea and fishing Example of lower risk level Example of higher risk level
Risk assessment Awareness of potential risks of fishing methods to seabirds. Knowledge of where and when the birds are concentrated. No understanding of how fishing practices create risks for birds.
Preventive and mitigation measures Avoidance measures are implemented and monitored. Avoidance measures are included into beneficial management practices. No record or best management practices implemented.

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