Tracking pan-continental trends in environmental contamination using sentinel raptors – what types of samples should we use?

Espín, S.; García-Fernández, A.J.; Herzke, D.; Shore, R.F.; van Hattum, B.; Martínez-López, E.; Coeurdassier, M.; Eulaers, I.; Fritsch, C.; Gómez-Ramírez, P.; Jaspers, V.L.B.; Krone, O.; Duke, G.; Helander, B.; Mateo, R.; Movalli, P.; Sonne, C.; van den Brink, N.W.