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On the other hand, a "normal" temperature may be a fever, if it is unusually high for that person; for example, medically frail elderly people have a decreased ability to generate body heat, so a "normal" temperature of 37.3 °C (99.1 °F) may represent a clinically significant fever.
A gun dog retrieving a duck during a hunt. People have used hunting dogs to help chase down and retrieve animals, [183] and birds of prey to catch birds and mammals, [184] while tethered cormorants have been used to catch fish. [185] Poison dart frogs have been used to poison the tips of blowpipe darts.
A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia (/ m ə ˈ m eɪ l i. ə /).Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle ear bones.
Illustration of grief from Charles Darwin's 1872 book The Expression of the Emotions in Man and Animals. Human motivation is not yet wholly understood. From a psychological perspective, Maslow's hierarchy of needs is a well-established theory that can be defined as the process of satisfying certain needs in ascending order of complexity. [317]
The record cold maximum is 4 °F (−16 °C) on December 22, 1989 (during the December 1989 United States cold wave). The record warm minimum is 84 °F (29 °C) on July 29, 1924. [34] The hardiness zone is 7a.
Adult frogs may live in or near water, but few are fully aquatic. [159] Almost all frog species are carnivorous as adults, preying on invertebrates, including insects, crabs, spiders, mites, worms, snails, and slugs. A few of the larger ones may eat other frogs, small mammals and reptiles, and fish.
With the advent of scientific interest in birds, many paintings of birds were commissioned for books. [ 316 ] [ 317 ] Among the most famous of these bird artists was John James Audubon , whose paintings of North American birds were a great commercial success in Europe and who later lent his name to the National Audubon Society . [ 318 ]
Humboldt County children are at greater risk of dangerously elevated blood lead levels than Flint, Michigan's – and almost double that of any other California county measured. The cases are concentrated in Eureka's Old Town and downtown areas. [57] [58] [59]