Obtaining measures of population size and fitness are key first steps to understanding how and why species' populations change over time. Quantifying such metrics is difficult in some species, however ...

To evaluate (1) whether three migratory nightjar species (Family Caprimulgidae) adhere to Bergmann’s rule, (2) whether environmental factors on the breeding or wintering grounds determine body size, ...

Get to know your square Your Regional Organiser will give you the grid reference of your 1-km Winter Bird Survey square. To find the location of your square: Visit the Ordnance Survey website Enter ...

Why are we conducting the Winter Bird Survey? The Winter Bird Survey will: Help us understand how wintering birds benefit from using agri-environment scheme and agri-environment and climate scheme ...

About the surveyThe Winter Bird Survey is a UK-wide repeat of the 2018/19 English Winter Bird Survey. Like its forerunner, the Winter Bird Survey covers a single season, collecting important ...

About owl eyes Each of the owl’s eyes is held within a rigid tube, something that severely limits the bird’s ability to move its eyes; owls cannot roll their eyes, for example. This may be one reason ...

Autumn and winter are wonderful times to get out to your local waterbody and enjoy the many ducks and geese that migrate here from colder climes. In these interactive online workshops, Gethin and ...