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2. Avian ecology field methods - Wikipedia

   en.wikipedia.org/wiki/Avian_ecology_field_methods

   Perhaps the simplest method of counting birds is called a "point count", in which a trained observer records all the birds seen and heard from a point count station for a set period of time. [1] A series of point counts completed over a fixed route can then be compared to the results of the same point counts in other seasons or years.

3. Aussie Bird Count - Wikipedia

   en.wikipedia.org/wiki/Aussie_Bird_Count

   The Aussie Bird Count is a project of BirdLife Australia. It is a citizen science project in which volunteers conduct bird counts around Australia. [1] In the 2017 bird count, almost two million birds were counted. [2] In 2022, the project was renamed to the Aussie Bird Count to reflect the ability to count in any outdoor space.

4. Bird measurement - Wikipedia

   en.wikipedia.org/wiki/Bird_measurement

   Bird measurement or bird biometrics are approaches to quantify the size of birds in scientific studies. The variation in dimensions and weights across birds is one of the fundamental sources of diversity among birds, and even Within species, dimensions may vary across populations within species , between the sexes and depending on age and ...

5. Bird ringing - Wikipedia

   en.wikipedia.org/wiki/Bird_ringing

   Bird ringing (UK) or bird banding (US) is the attachment of a small, individually numbered metal or plastic tag to the leg or wing of a wild bird to enable individual identification. This helps in keeping track of the movements of the bird and its life history.

6. Great Backyard Bird Count - Wikipedia

   en.wikipedia.org/wiki/Great_Backyard_Bird_Count

   The Great Backyard Bird Count (GBBC) is a community science project in ornithology. It is conducted annually in mid-February. The event is supported by the Cornell Lab of Ornithology and the National Audubon Society. During this four-day event, birdwatchers around the world are invited to count and report details of birds in the area in which ...

7. List of birds by population - Wikipedia

   en.wikipedia.org/wiki/List_of_birds_by_population

   The average global population of all mature birds is estimated to be on the order of 100 billion individuals. [1] [2] [3] The total population including younglings is somewhat higher during the breeding season of each species. [3] This list is incomplete, because experts have not estimated all bird numbers.