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extinction

(Encyclopedia)extinction, in biology, disappearance of species of living organisms. Extinction usually occurs as a result of changed conditions to which the species is not suited. If no member of the affected speci...

mass extinction

(Encyclopedia)mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five greatest were thos...

trapping

(Encyclopedia)trapping, most broadly, the use of mechanical or deceptive devices to capture, kill, or injure animals. It may be applied to the practice of using birdlime to capture birds, lobster pots to trap lobst...

Farnese Palace

(Encyclopedia)Farnese Palace, in Rome, designed by Antonio da Sangallo (see under Sangallo) for Cardinal Alessandro Farnese (Pope Paul III). It was begun before 1514 and, after the architect's death, was continued ...

Breisgau

(Encyclopedia)Breisgau brīsˈgou [key], region, Baden-Württemburg, SW Germany, including the Rhine plain and the western slopes of the Black Forest. Freiburg is the chief city. After the extinction (1218) of the ...

Hornaday, William Temple

(Encyclopedia)Hornaday, William Temple hôrˈnədā [key], 1854–1937, American naturalist, b. Plainfield, Ind. He was educated at Iowa State College (now Iowa State Univ.), continued his study of zoology and muse...

Albert of Brandenburg

(Encyclopedia)Albert of Brandenburg, 1490–1568, grand master of the Teutonic Knights (1511–25), first duke of Prussia (1525–68); grandson of Elector Albert Achilles of Brandenburg. In 1525 he became a Protest...

Beer's law

(Encyclopedia)Beer's law [for August Beer], physical law stating that the quantity of light absorbed by a substance dissolved in a nonabsorbing solvent is directly proportional to the concentration of the substance...

Jülich, former duchy, Germany

(Encyclopedia)Jülich yüˈlĭkh [key], former duchy, Germany, between Cologne and Aachen. At first a county, Jülich was raised to a duchy in 1356, and in 1423 it was united with the county of Berg. After the exti...

otter

(Encyclopedia)otter, name for a number of aquatic, carnivorous mammals of the weasel family, found on all continents except Australia. The common river otters of Eurasia and the Americas are species of the genus Lu...