Individual Variation in the Over-Summering Areas of Immature Short-Toed Snake EaglesCircaetus gallicus

摘要: Satellite tracking is an invaluable tool in the study of bird movements. However, normally small sample size it involves makes difficult to obtain data spanning entire range migratory behaviour found particular populations. We recently reported that Spanish immature Short-toed Snake Eagles leave their winter quarters sub-Saharan Africa occupy summering areas northern (north Sahara), contrast previously a young French eagle which remained during summer wintering range. A more recent increase tracked snake eagles further extends our knowledge this species with one reaching European but occupying four widely-separated course summer. In short-term, technology progress may provide normal use representative samples accuracy movement ecology studies.