Birdwatching or birding is the observation and study of birds with the naked eye or through a visual enhancement device like binoculars. Birding often involves a significant auditory component, as many bird species are more readily detected and identified by ear than by eye. Most birders and birdwatchers pursue this activity for recreational or social reasons, unlike ornithologists, who are engaged in the formal scientific study of birds.
Birding has emerged in recent decades as a popular hobby in the United States. Hundreds of thousands of people consider themselves to be serious birders, and several million regard themselves as casual birders. Birding is even more popular in Britain than it is in the United States. Roger Tory Peterson played a central role in the emergence and defining of modern birding, both in the United States and Britain.
Birding in the United States was focused in the early and mid-20th century in the eastern seaboard region, with persons such as Roger Tory Peterson and Ludlow Griscom being especially influential in the early days. In the mid- to late 20th century, many of the pioneering developments in American birding came out of California, where Guy McCaskie was particularly influential.The most active times of the year for birding in temperate zones are during the spring or fall migrations when the greatest variety of birds may be seen. On these occasions, large numbers of birds travel north or south to wintering or nesting locations.
Early morning is typically the best time of the day for birding since many birds are searching for food which makes them easier to find and observe.
Birders who are keen rarity-seekers will travel long distances to locate new and rare species, intending to add these to their list of personally observed birds. These lists often take the form of a life list, national list, state list, county list, or year list.
Seawatching is a type of birdwatching where observers based at a coastal watch point, such as a headland, watch birds flying over the sea. This is one form of pelagic birding, by which pelagic bird species are viewed. Another way birders view pelagic species is from seagoing vessels.
Many birders take part in censuses of bird populations and migratory patterns which are sometimes specific to individual species. These birders may also count all birds in a given area, as in the Christmas Bird Count. This citizen science can assist in identifying environmental threats to the well-being of birds or, conversely, in assessing outcomes of environmental management initiatives intended to ensure the survival of at-risk species or encourage the breeding of species for aesthetic or ecological reasons. This more scientific side of the hobby is an aspect of ornithology, coordinated in the UK by the British Trust for Ornithology.
Increasing seasonal bird populations can be a good indication of biodiversity or the quality of different habitats. Some species are persecuted as vermin, often illegally, as with the case of the Hen Harrier in Britain.
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