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birdsong

(Encyclopedia)birdsong. Song, call notes, and certain mechanical sounds constitute the language of birds. Song is produced in the syrinx, whose firm walls are derived from the rings of the trachea, and is modified ...

beta-blocker

(Encyclopedia)beta-blocker or beta-adrenergic blocking agent bāˈtə ădˌrənûrˈjĭk [key], drug that reduces the symptoms connected with hypertension, cardiac arrhythmias, angina pectoris, migraine headaches, ...

stork

(Encyclopedia)stork, common name for members of a family of long-legged wading birds. The storks are related to the herons and ibises and are found in most of the warmer parts of the world. Storks have long, broad,...

Scilly Islands

(Encyclopedia)Scilly Islands sĭlˈē [key], officially Isles of Scilly, archipelago and unitary authority (2001 pop. 2,153), encompassing more than 150 isles and rocky islets, off Cornwall, SW England, 28 mi (45 k...

quelea

(Encyclopedia)quelea kwēˈlēə [key], common name for an East African weaverbird, Quelea quelea. Less than 5 in. (13 cm) long and weighing slightly more than 1⁄2 oz (1.4 grams), these tiny birds are found throu...

rail

(Encyclopedia)rail, common name for some members of the large family Rallidae, marsh and tropical forest birds that include the gallinule and the coot, two specialized rails. Rails are cosmopolitan in distribution,...

Bacon's Rebellion

(Encyclopedia)Bacon's Rebellion, popular revolt in colonial Virginia in 1676, led by Nathaniel Bacon. High taxes, low prices for tobacco, and resentment against special privileges given those close to the governor,...

chart

(Encyclopedia)chart, term referring to maps prepared for marine navigation and for air navigation. All charts show, in some convenient scale, geographic features useful to the navigator, as well as indications of d...

era

(Encyclopedia)era, period of historic time. In geology, it is the name applied to large divisions of geological process, e.g., Paleozoic era (see geology). In chronology an era is a period reckoned from a fixed poi...

hummingbird

(Encyclopedia)hummingbird, common name for members of the family Trochilidae, small, strictly New World birds, related to the swifts, and found chiefly in the mountains of South America. Hummingbirds vary in size f...