Birds come in many different shapes, sizes, and colors. The one thing that makes birds so unique is the fact they all have feathers. In fact, birds are the only animals that have feathers.
1. Did you know, there are many different uses of feathers on a bird? Each type of feather is adapted to serve a specific role or function:
* flight
* thermo-regulation (keeping warm and cool) * protection from impact * defense (both physical and visual) * incubation of eggs * brooding of young * display (both visual and aural) * camouflage * hunting by touch * carrying water (in some cases) 2. Did you know? Color in birds is not a simple thing, but a complex, specific recipe.
For decades, scientists have known how birds with yellow or red feathers usually get their color: It comes from pigments in foods the birds eat. The pink color of flamingoes, for example, is derived from carotenoids found in the crustaceans and algae that the birds sieve from the water. BLACK, BROWN, WHITE: Melanin produces black or dark brown coloration. White feathers are caused by a lack of pigmentation. RED, ORANGE, YELLOW: carotenoids pigments produce red, orange or yellow feathers and are produced by plants. When birds ingest either plant matter or something that has eaten a plant, they also ingest the carotenoids that produce the colors in their feathers. GREEN: Porphyrin pigments are essentially modified amino acids. Porphyrins are the rarest of the three pigment groups and can produce red, brown, pink and green colors. The best-known example of porphyrins is the red pigment (often called turacin) that is found in many turaco species and turacoverdin, the green pigment found in many of the same turaco species. BLUE: When white light strikes a blue feather, the keratin pattern (a tough protein of which feathers are made of) causes red and yellow wavelengths to cancel each other out. The result: blue, an example of what scientists call a structural color. And different shapes and sizes of air pockets and keratin make different shades of blue. 3. Did you know, Sonic Hedgehog plays an important role in the development of feathers? No, not that Sonic the Hedgehog! Sonic Hedgehog are signaling genes that act like dimmer switches, controlling not just the activation of cell growth but the intensity as well. When researchers examined the genetics of feather growth they found Sonic Hedgehog directing the show, coordinating the intricate dance of starts and stops of cell growth. It is a gene that produces a protein that acts in concert with other proteins to activate or inhibit a highly conserved metabolic pathway - simple right!? Maybe to a molecular geneticist. A large team of people who worked on isolating and decoding the Sonic Hedgehog gene and their efforts contributed to a Nobel Prize in Physiology in 1995. It is known they spent countless hours in the laboratory and that they were meticulous, patient observers. It is also known that they played a lot of video games. 4. Which birds produce the 'most powder' from their preen gland? Birds use their beaks to preen or clean and arrange their feathers. Most birds have a gland which releases oil called the preening gland. Enormous concentration and time is spent oiling and cleaning feathers. The preening gland is very important to the health of a bird's feathers as it releases oil (or in some birds a white powdery substance) which birds spread all over their feathers with their beak while preening. The oil or powder helps maintain the feathers cleanliness, protects the bird from becoming wet by making the contour feathers waterproof. African Grey parrots, Cockatoos, and Cockatiels produce the most powder from their preen gland. Amazon Parrots and Hyacinth Macaws do not have a preen gland. 5. Feather fault bars - Who's at fault? Fault bars (fault lines, stress bars) can look like bars or lines that run perpendicular across a bird's feathers. They are translucent and look like bands. Recent research has uncovered that fault bars in feathers are the result of a multitude of factors such as: handling, exposure to bad weather, living conditions, and being exposed to loud noises such as traffic. Stress, change in diet, and immunities are also known to have caused fault bars on feathers. Not all birds produce fault bars due to the same factors or at the same rate. Different species produce fault bars under different circumstances. Some species are more prone to fault bars than others. Like examining rings in a log, some scientists can tell the condition a bird was in the year before just by looking at their fault bars. It is really amazing that fault bars can tell so much about a bird's condition both in the past and in the future. |