BTO Research Report 666 - How high do birds fly - phase 1 review of current datasets and methodologies

The consideration of flight heights is a key factor determining how seabirds interact with offshore wind farms. Of particular interest is the need to accurately predict flight heights, in order to feed into predictive Collision Risk Models (CRM). Data within CRM have traditionally relied quite heavily on boat surveys collected by observers, but now routinely, different methods are being used to estimate flight heights of birds.