The population size of animals may change because of variation in the number of births or deaths, or because individuals move between populations. Understanding these "demographic rates" helps us determine why populations are changing and what actions may be effective in conserving or managing the population. BTO's Ringing and Nest Record Schemes enable us to measure the effects of changes at different points in the life cycle and so understand better the difficulties our bird populations face.


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Hazel McCambridge
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Hazel McCambridge

Hazel is the lead organiser of Nest Box Challenge and Norfolk Bat Survey. She also provides clerical support to the Ringing and Nest Record Scheme, working on data collection, volunteer communication and licensing.