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2. Finnstick - Wikipedia

   en.wikipedia.org/wiki/Finnstick

   The finnstick is especially useful when watching migration (e.g. seabirds, raptors) when the horizon may be scanned literally for hours to find migrant birds. As the name implies the stick was invented by the Finns but is now also used in other countries, mainly in Europe. Alternative strategies for steadying the binoculars include supporting ...

3. Birdwatching - Wikipedia

   en.wikipedia.org/wiki/Birdwatching

   Three people birdwatching with binoculars. Birdwatching, or birding, is the observing of birds, either as a recreational activity or as a form of citizen science.A birdwatcher may observe by using their naked eye, by using a visual enhancement device such as binoculars or a telescope, by listening for bird sounds, [1] [2] watching public webcams, or by viewing smart bird feeder cameras.

4. Bird vision - Wikipedia

   en.wikipedia.org/wiki/Bird_vision

   The forward-facing eyes of a bird of prey give binocular vision, which is assisted by a double fovea. [4] The raptor's adaptations for optimum visual resolution (an American kestrel can see a 2–mm insect from the top of an 18–m tree) has a disadvantage in that its vision is poor in low light level, and it must roost at night. [1]

5. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

6. Binocular vision - Wikipedia

   en.wikipedia.org/wiki/Binocular_vision

   Principle of binocular vision with horopter shown. In biology, binocular vision is a type of vision in which an animal has two eyes capable of facing the same direction to perceive a single three-dimensional image of its surroundings. Binocular vision does not typically refer to vision where an animal has eyes on opposite sides of its head and ...

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