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The downy chick has uniformly pale brown plumage, and the fledged juvenile resembles the adult except that it has a dark head, light grey legs, and a pale bill. The unfeathered areas of the young bird's head and neck gradually become red as it matures. [7] Moroccan birds have a significantly longer bill than Turkish birds of the same sex. [24]
The deep fovea points forward at an approximate 45° angle, while the shallow fovea points approximately 15° to the right or left of the head axis. [42] Several raptor species repeatedly cock their heads into three distinct positions while observing an object. First, is straight ahead with their head pointed towards the object.
Ling-Ling (bottom) being playfully nipped by Hsing-Hsing after mating, March 18, 1983. Ling-Ling (Chinese: 玲玲, 1969–1992) and Hsing-Hsing (simplified Chinese: 兴兴; traditional Chinese: 興興, 1970–1999) were two giant pandas given to the United States as gifts by the government of China following President Richard Nixon's visit in 1972.
The Panda's Thumb: More Reflections in Natural History (1980) is a collection of 31 essays by the Harvard University paleontologist Stephen Jay Gould. It is the second volume culled from his 27-year monthly column "This View of Life" in Natural History magazine. Recurring themes of the essays are evolution and its teaching, science biography ...
On average, a skua is about 56 cm (22 in) long, and 121 cm (48 in) across the wings. They have longish bills with a hooked tip, and webbed feet with sharp claws. They look like large dark gulls, but have a fleshy cere above the upper mandible. The skuas are strong, acrobatic fliers. They are generally aggressive in disposition.
The head/tail breaks is motivated by inability of conventional classification methods such as equal intervals, quantiles, geometric progressions, standard deviation, and natural breaks - commonly known as Jenks natural breaks optimization or k-means clustering to reveal the underlying scaling or living structure with the inherent hierarchy (or heterogeneity) characterized by the recurring ...
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Stadiametric rangefinding, or the stadia method, is a technique of measuring distances with a telescopic instrument. The term stadia comes from a Greek unit of length Stadion (equal to 600 Greek feet, pous ) which was the typical length of a sports stadium of the time.