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The kiwi is a family of nocturnal birds endemic to New Zealand.. While it is difficult to say which came first, nocturnality or diurnality, a hypothesis in evolutionary biology, the nocturnal bottleneck theory, postulates that in the Mesozoic, many ancestors of modern-day mammals evolved nocturnal characteristics in order to avoid contact with the numerous diurnal predators. [3]
To an untrained observer, it may not be obvious that a drowning person is in distress. The victim may appear to be swimming safely, but the victim is actually within 20–60 seconds of sinking under the surface and thus dying. [3] They extend their arms laterally and press down on the water's surface in order to lift their mouth out of the water.
The researchers who documented this behaviour called it "sleep-swimming". [33] Sleep could also be absent during specific parts of a fish's life. Species normally quiescent at night become active day and night during the spawning season. [1] Many parental species forego sleep at night and fan their eggs day and night for many days in a row.
A similar reason may account for the many species of fungi that emit light. Species in the genera Armillaria, Mycena, Omphalotus, Panellus, Pleurotus and others do this, emitting usually greenish light from the mycelium, cap and gills. This may attract night-flying insects and aid in spore dispersal, but other functions may also be involved. [49]
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Light-time correction can be applied to any object whose distance and motion are known. In particular, it is usually necessary to apply it to the motion of a planet or other Solar System object. For this reason, the combined displacement of the apparent position due to the effects of light-time correction and aberration is known as planetary ...
Black People Will Swim, based in Queens, N.Y., teaches hundreds of New Yorkers of color, with limited pool access, how to swim each year.
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