Figure 2.

Response in eagle flight behaviour, measured as height band (max–min flight altitude; HB) to variation in (a) wind speed (WS); and (b) average above-ground altitude (AGL) of 10 golden eagles migrating through the central Appalachians in 2009–2010. Eagles responded to increases in WS by decreasing altitudinal variation in flight. Likewise, as AGL increased, HB also increased. WS was determined from NCEP weather blocks [12]. Regression lines are from 2009 data (solid) and 2010 data (dotted).