Fig. 3
From: An autonomous GPS geofence alert system to curtail avian fatalities at wind farms
Map of geofence alert zones installed around a wind farm in Mexico that threatens avifauna. Flight path of a California condor that was GPS-tracked crossing the USA/Mexico border and intersecting the Energía Sierra Juárez Wind-energy Project (purple diamonds) is indicated by the red line. Concentric outer 40 km (yellow) and inner 20 km (red) virtual geofence zones were placed around the wind-energy project to provide automatic SMS alerts of the ingress of telemetered birds