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INTRODUCTORY TEXT TO THE LESSON This e-lesson takes place on the banks of the Carvalhais stream. Here, a researcher will explain us how to monitor the population of birds for scientific purposes, demonstrating his work in situ. The main objectives are to describe how the capture is performed under safe conditions and, then, to evaluate some biometric parameters, such as species, sex, age, wing length, weight and fat. These parameters allow monitoring the species each time they are recaptured, for example from the perspective of migratory movements, life expectancy or the structure of bird populations.