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  2. Bird (mathematical artwork) - Wikipedia

    en.wikipedia.org/wiki/Bird_(mathematical_artwork)

    The 500 line segments defined above together form a shape in the Cartesian plane that resembles a bird with open wings. Looking at the line segments on the wings of the bird causes an optical illusion and may trick the viewer into thinking that the segments are curved lines. Therefore, the shape can also be considered as an optical artwork.

  3. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

  4. Bird intelligence - Wikipedia

    en.wikipedia.org/wiki/Bird_intelligence

    The birds then congregate in massive flocks made up of several different species for migratory purposes. Some birds make use of teamwork while hunting. Predatory birds hunting in pairs have been observed using a "bait and switch" technique, whereby one bird will distract the prey while the other swoops in for the kill.

  5. Ornithology - Wikipedia

    en.wikipedia.org/wiki/Ornithology

    Morphometric measurements of birds are important in systematics. The use of bird skins to document species has been a standard part of systematic ornithology. Bird skins are prepared by retaining the key bones of the wings, legs, and skull along with the skin and feathers.

  6. Number sense in animals - Wikipedia

    en.wikipedia.org/wiki/Number_sense_in_animals

    Birds were one of the first animal species tested on their number sense. A raven named Jacob was able to distinguish the number 5 across different tasks in the experiments by Otto Koehler. [ 5 ] Later experiments supported the claim of existence of a number sense in birds, with Alex , a grey parrot, able to label and comprehend labels for sets ...

  7. Birdwatching basics: a beginner's guide - AOL

    www.aol.com/birdwatching-basics-beginners-guide...

    A bird field guide is crucial in helping you identify different species. These guides typically include pictures, descriptions and range maps. And don’t forget a notebook to keep a record of the ...

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