Map the bird evidence to the proposed turbine and infrastructure layout.

NatureScot guidance expects bird survey information to show survey areas, vantage points and relevant results. Check whether flight activity, breeding locations and other important use of the site can be understood spatially.

Check survey effort and vantage-point coverage.

Review dates, seasons, hours, visibility, vantage-point locations, viewsheds and overlap. A large number of survey hours does not by itself demonstrate that the areas relevant to collision or displacement were adequately observed.

Separate different effect pathways.

Collision risk, displacement, disturbance, habitat loss and barrier effects are different mechanisms and may affect different species. Check that the assessment does not use evidence about one pathway to dismiss another.

Read the collision-risk model inputs.

Where modelling is used, identify flight activity, rotor dimensions, operational assumptions, avoidance rates and any correction factors. The model output is only as reliable as the inputs and assumptions.

Check cumulative assessment.

Where relevant populations may be affected by more than one wind farm or development, examine the projects and effects included and whether the population context is consistent across the assessment.

Check mitigation and monitoring separately.

Habitat management, turbine shutdown or curtailment, construction timing and post-construction monitoring serve different purposes. Identify what is actually proposed and how it is secured.

Sources and further information

NatureScot - Recommended bird survey methods for onshore wind farms

NatureScot - Pre-application guidance for onshore wind farms

NatureScot - Development Management and the Natural Heritage

Last checked: 26 September 2026

Check whether the survey design matches the site and turbine layout.

Review habitat appraisal, detector locations, survey periods and the relationship between recorded activity and proposed turbine locations, tracks, woodland edges, watercourses and other features used by bats.

Distinguish species presence from collision risk.

Different species have different flight behaviour and vulnerability around turbines. The assessment should explain how activity, species composition, habitat and turbine siting inform risk.

Check how buffers and micro-siting are used.

Where separation from woodland, trees or other habitat is part of mitigation, identify how the distance is measured and whether later micro-siting could reduce it.

Examine curtailment proposals carefully.

Operational curtailment can reduce risk, but the important questions include trigger conditions, turbine coverage, seasonal period, wind-speed or weather parameters, monitoring and how the regime can be adjusted if evidence shows continuing mortality.

Check whether post-construction monitoring has a decision pathway.

Monitoring is most useful where results lead to defined review or mitigation action. A commitment to collect data without a mechanism for responding to it should not be confused with a complete mitigation strategy.

Sources and further information

NatureScot - Planning and development: renewable energy

NatureScot - Pre-application guidance for onshore wind farms

NatureScot - Development Management and the Natural Heritage

Last checked: 26 September 2026