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Bat Emergence/Re-entry Surveys
Bat emergence/re-entry surveys are undertaken at dusk or dawn between April and September, they identify whether bats are present within a structure and provide additional confidence in a negative survey result from a preliminary roost assessment survey if the building was identified as medium or high potential for a roost to be present.
The structure to be surveyed is surrounded by surveyors such that all potential entrance/exit points are covered. The structure is then watched from either 15 minutes before sunset to 2 hours after or 2 hours before dawn to sunrise.
All emerging or re-entering bats are recorded along with their flight path, their species and the time of flight.
An emergence survey would identify:
All survey methodology follows that detailed in the Bat Conservation Trust's Bat Surveys: Good Practice Guidelines 3rd Edition.