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A great cormorant swimming. Aquatic locomotion or swimming is biologically propelled motion through a liquid medium. The simplest propulsive systems are composed of cilia and flagella. Swimming has evolved a number of times in a range of organisms including arthropods, fish, molluscs, amphibians, reptiles, birds, and mammals.
The screensaver Neko.saver waited 5 years to move from version .91a to version .92, a universal binary. There's also a free-standing application for OS X 10.4 and up. [5] A shareware port titled Cat! or TopCAT! was made for Microsoft Windows 3.1 by Robert Dannbauer in 1991. A Windows 95 port was made by David Harvey from the X source.
After Dark is a series of computer screensaver software introduced by Berkeley Systems in 1989 for the Apple Macintosh, and in 1991 for Microsoft Windows. [3] [4]Following the original, additional editions included More After Dark, Before Dark, and editions themed around licensed properties such as Star Trek, The Simpsons, Looney Tunes, Marvel, and Disney characters.
Before the advent of LCD screens, most computer screens were based on cathode-ray tubes (CRTs). When the same image is displayed on a CRT screen for long periods, the properties of the exposed areas of the phosphor coating on the inside of the screen gradually and permanently change, eventually leading to a darkened shadow or "ghost" image on the screen, called a screen burn-in.
Birds that rely on lift based propulsion for swimming have been observed to utilize higher wing beat frequencies when flying than when submerged and swimming. [16] This observation follows directly from the logic that the increased density of water produces greater thrust for similar wing excursions, so for a given speed fewer wing beats are ...
A dark grey cat wanders through a forest when a pack of dogs arrive by the river to catch fish. When two of the dogs fight over a fish, the cat takes the fish and is immediately chased by the dogs. The cat loses the dogs, but notices a deer stampede before it is caught by a tsunami. The cat and the dogs survive the flood by reaching higher ground.
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Fish locomotion is the various types of animal locomotion used by fish, principally by swimming. This is achieved in different groups of fish by a variety of mechanisms of propulsion, most often by wave-like lateral flexions of the fish's body and tail in the water, and in various specialised fish by motions of the fins .