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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. Ornithology - Wikipedia

    en.wikipedia.org/wiki/Ornithology

    Studies in bird behaviour include the use of tamed and trained birds in captivity. Studies on bird intelligence and song learning have been largely laboratory-based. Field researchers may make use of a wide range of techniques such as the use of dummy owls to elicit mobbing behaviour, and dummy males or the use of call playback to elicit ...

  4. Coloring - Wikipedia

    en.wikipedia.org/wiki/Coloring

    Coloring or colouring may refer to: Color, or the act of changing the color of an object Coloring, the act of adding color to the pages of a coloring book; Coloring, the act of adding color to comic book pages, where the person's job title is Colorist; Graph coloring, in mathematics; Hair coloring; Food coloring; Hand-colouring of photographs ...

  5. How to Make Natural Food Coloring Using Everyday Ingredients

    www.aol.com/natural-food-coloring-using-everyday...

    Like any other food dye, natural food coloring comes in two forms: liquid or powdered. It’s all a matter of which ingredient you’re using to make the dye. It’s all a matter of which ...

  6. Grundy number - Wikipedia

    en.wikipedia.org/wiki/Grundy_number

    A Grundy coloring of a t-atom can be obtained by coloring the independent set first with the smallest-numbered color, and then coloring the remaining (t − 1)-atom with an additional t − 1 colors. For instance, the only 1-atom is a single vertex, and the only 2-atom is a single edge, but there are two possible 3-atoms: a triangle and a four ...

  7. Avian foraging - Wikipedia

    en.wikipedia.org/wiki/Avian_foraging

    Avian foraging refers to the range of activities and behaviours exhibited by birds in their quest for food. In addition to their unique body adaptations, birds have a range of described behaviours that differ from the foraging behaviours of other animal groups. According to the foraging habitat, birds may be grouped into foraging guilds ...

  8. 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 ...

  9. November retail sales top Wall Street's expectations

    www.aol.com/finance/november-retail-sales-top...

    November retail sales grew at a faster pace than Wall Street analysts had expected, reflecting continued resilience in the American consumer and indicating that the holiday shopping season in the ...