Wikipedia:Main Page history/2017 October 27

 Welcome to Wikipedia, the free encyclopedia that anyone can edit. 5,499,949 articles in English  Arts Biography Geography History Mathematics Science Society <li style="position:absolute; left:66%; top:1.6em;">Technology</li> <li style="position:absolute; left:66%; top:3.2em;"> All portals </li> </ul>

<div id="mp-middle" class="MainPageBG" style="margin-top:4px; border:1px solid #f2cedd; background:#fff5fa; overflow:auto;"> <h2 id="mp-tfl-h2" style="margin:0.5em; background:#f2cedd; font-family:inherit; font-size:120%; font-weight:bold; border:1px solid #bfa3af; color:#000; padding:0.2em 0.4em">From today's featured list <div class="thumbinner mp-thumb" style="background: transparent; border: none; padding: 0; max-width: 125px;"> A budgerigar with pin feathers showing There are thousands of common English language terms that are used in relation to the study of birds—warm-blooded vertebrates of the class Aves, characterized by <span title="See entry at: Glossary of bird terms &sect;&#8198;feathers" style="color:inherit; " class="">feathers, the ability to <span title="See entry at: Glossary of bird terms &sect;&#8198;flight" style="color:inherit; " class="">fly  in all but the approximately 60 extant species of flightless birds, toothless, <span title="See entry at: Glossary of bird terms &sect;&#8198;beak" style="color:inherit; " class="">beaked  <span title="See entry at: Glossary of bird terms &sect;&#8198;mandible" style="color:inherit; " class="">jaws  , the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart and a strong yet lightweight skeleton. Among other details such as size, proportions and shape, terms defining bird features developed and are used to describe features unique to the class—especially evolutionary adaptations that developed to aid flight. There are, for example, numerous terms describing the complex structural makeup of feathers (e.g., <span title="See entry at: Glossary of bird terms &sect;&#8198;barbules" style="color:inherit; " class="">barbules, <span title="See entry at: Glossary of bird terms &sect;&#8198;rachides" style="color:inherit; " class="">rachides  and <span title="See entry at: Glossary of bird terms &sect;&#8198;vanes" style="color:inherit; " class="">vanes  ); types of feathers (e.g., <span title="See entry at: Glossary of bird terms &sect;&#8198;filoplume" style="color:inherit; " class="">filoplume  , <span title="See entry at: Glossary of bird terms &sect;&#8198;pennaceous" style="color:inherit; " class="">pennaceous  and <span title="See entry at: Glossary of bird terms &sect;&#8198;plumulaceous" style="color:inherit; " class="">plumulaceous  feathers); and their growth and loss (e.g., <span title="See entry at: Glossary of bird terms &sect;&#8198;colour mourph" style="color:inherit; " class="">colour mourph  , <span title="See entry at: Glossary of bird terms &sect;&#8198;nuptial plumage" style="color:inherit; " class="">nuptial plumage  and <span title="See entry at: Glossary of bird terms &sect;&#8198;pterylosis" style="color:inherit; " class="">pterylosis  ). Although some terms in the area may be familiar, such as <span title="See entry at: Glossary of bird terms &sect;&#8198;back" style="color:inherit; " class="">back or <span title="See entry at: Glossary of bird terms &sect;&#8198;belly" style="color:inherit; " class="">belly , they too are defined in relation to distinct features of external bird anatomy, sometimes called <span title="See entry at: Glossary of bird terms &sect;&#8198;topography" style="color:inherit; " class="">topography. (Full glossary...)

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