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Flocking
Flocking is the behavior exhibited when a group of birds, called a flock, are foraging or in flight. Sheep and goats also exhibit flocking behavior. Flocking by birds and mammals is similar to schooling in fish and these are often studied together. Flocking is generally believed to arise from the need for cover and protection from predators in animal behavior. This is an emergent behaviour governed by local rules that are followed by individuals and does not involve any central coordination. In nature There are parallels with the shoaling behaviour of fish, the swarming behaviour of insects, and herd behaviour of land animals. During the winter months, starlings are known for aggregating into huge flocks of hundreds to thousands of individuals, murmurations, which when they take flight altogether, render large displays of intriguing swirling patterns in the skies above observers. Measurement Measurements of bird flocking have been made using high-speed cameras, and a co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Bird
Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a four-chambered heart, and a strong yet lightweight Bird skeleton, skeleton. Birds live worldwide and range in size from the bee hummingbird to the common ostrich. There are over 11,000 living species and they are split into 44 Order (biology), orders. More than half are passerine or "perching" birds. Birds have Bird wing, wings whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further evolution has led to the Flightless bird, loss of flight in some birds, including ratites, penguins, and diverse endemism, endemic island species. The digestive and respiratory systems of birds are also uniquely a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Flock (birds)
A flock is a gathering of individual birds to forage or travel collectively. Avian flocks are typically associated with migration. Flocking also offers foraging benefits and protection from predators, although flocking can have costs for individual members. Flocks are often defined as groups consisting of individuals from the same species. However, mixed flocks consisting of two or more species are also common. Avian species that tend to flock together are typically similar in taxonomy and share morphological characteristics such as size and shape. Mixed flocks offer increased protection against predators, which is particularly important in closed habitats such as forests where early warning calls play a vital importance in the early recognition of danger. The result is the formation of many mixed-species feeding flocks. Mixed flocks While mixed flocks are typically thought to comprise two different species, it is specifically the two different behaviours of the species that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Peloton
In a road Cycle sport, bicycle race, the peloton (, originally meaning ) is the main group or pack of riders. Riders in a group save energy by riding close (drafting (racing), drafting or slipstreaming) to (particularly behind) other riders. The reduction in drag (physics), drag is dramatic; riding in the middle of a well-developed group, drag can be reduced by as much as 95%. Exploitation of this potential energy saving leads to complex cooperative and competitive interactions between riders and teams in race tactics. The term is also used to refer to the community of professional cyclists in general. Definition More formally, a peloton is defined as "two or more cyclists riding in sufficiently close proximity to be located either in one of two basic positions: (1) behind cyclists in zones of reduced air pressure, referred to as ‘drafting’, or (2) in non-drafting positions where air pressure is highest. Cyclists in drafting zones expend less energy than in front positions." A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Boids
Boids is an artificial life program, developed by Craig Reynolds in 1986, which simulates the flocking behaviour of birds, and related group motion. His paper on this topic was published in 1987 in the proceedings of the ACM SIGGRAPH conference. The name "boid" corresponds to a shortened version of "bird-oid object", which refers to a bird-like object, as well as referencing the stereotypical New York pronunciation of 'bird' as . Reynolds' boid model is one example of a larger general concept, for which many other variations have been developed since. The closely related work of Ichiro Aoki is noteworthy because it was published in 1982 — five years ''before'' Reynolds' boids paper. Model details Like most artificial life simulations, Boids is an example of emergent behavior; that is, the complexity of Boids arises from the interaction of individual agents (the boids, in this case) adhering to a set of simple rules. The rules applied in the simplest Boids world are as f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Collective Animal Behaviour
Collective animal behaviour is a form of social behavior involving the coordinated behavior of large groups of similar animals as well as emergent properties of these groups. This can include the costs and benefits of group membership, the transfer of information, decision-making process, locomotion and synchronization of the group. Studying the principles of collective animal behavior has relevance to human engineering problems through the philosophy of biomimetics. For instance, determining the rules by which an individual animal navigates relative to its neighbors in a group can lead to advances in the deployment and control of groups of swimming or flying micro-robots such as UAVs (Unmanned Aerial Vehicles). Examples Examples of collective animal behavior include: * Flocking birds * Herding ungulates * Shoaling and schooling fish * Schooling Antarctic krill * Pods of dolphins * Marching locusts * Nest building ants * Swarming * Stampede History The basis of collecti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Shoaling And Schooling
In biology, any group of fish that stay together for social reasons are shoaling, and if the group is swimming in the same direction in a coordinated manner, they are schooling. In common usage, the terms are sometimes used rather loosely. About one quarter of fish species shoal all their lives, and about one half shoal for part of their lives. Fish derive many benefits from shoaling behaviour including defence against predators (through better predator detection and by diluting the chance of individual capture), enhanced foraging success, and higher success in finding a mate. It is also likely that fish benefit from shoal membership through increased hydrodynamic efficiency. Fish use many traits to choose shoalmates. Generally they prefer larger shoals, shoalmates of their own species, shoalmates similar in size and appearance to themselves, healthy fish, and kin (when recognized). The oddity effect posits that any shoal member that stands out in appearance will be preferen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Grus Grus Flocks
Grus may refer to: * ''Grus'' (genus), a genus of birds in the crane family ** ''Grus grus'', the common crane * Grus (constellation), the constellation "Crane" * Grus (geology) Grus is an accumulation of angular, coarse-grained fragments (particles of sand and gravel) resulting from the granular disintegration by the processes of chemical weathering, chemical and mechanical weathering of crystalline rocks (most notably ..., an accumulation of angular, coarse-grained fragments (particles of sand and gravel) resulting from the granular disintegration of crystalline rocks See also * Gruss (other) * GRU (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Crowd
A crowd is as a group of people that have gathered for a common purpose or intent. Examples are a Demonstration (people), demonstration, a Sport, sports event, or a looting (classified in sociology as an acting crowd). A crowd may also simply be made up of many people going about their business in a busy area. The term "the crowd" may sometimes refer to the lower orders of people in general. Terminology The term "crowd" is sometimes defined in contrast to other group nouns for collections of humans or animals, such as aggregation, audience, group, mass, mob, populous, public, rabble and throng. Opinion researcher Vincent Price (educator), Vincent Price compares masses and crowds, saying that "Crowds are defined by their shared emotional experiences, but masses are defined by their interpersonal isolation."''Public Opinion'', by Carroll J. Glynn, Susan Herbst, Garrett J. O'Keefe, Robert Y. Shapiro In human sociology, the term "mobbed" simply means "extremely wikt:crowded, c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Batman Returns
''Batman Returns'' is a 1992 American superhero film directed by Tim Burton and written by Daniel Waters (screenwriter), Daniel Waters. Based on the DC Comics character Batman, it is the sequel to ''Batman (1989 film), Batman'' (1989) and the second installment in the Batman (1989 film series), 1989–1997 ''Batman'' series. In the film, Batman comes into conflict with wealthy industrialist Max Shreck and malformed crime boss Oswald Cobblepot (Batman Returns), Oswald Cobblepot / The Penguin, who seek power regardless of the cost to Gotham City. Their plans are complicated by Shreck's former secretary, Selina Kyle (1989 film series character), Selina Kyle, who seeks revenge against him as Catwoman. The cast includes Michael Keaton, Danny DeVito, Michelle Pfeiffer, Christopher Walken, Michael Gough, Pat Hingle, and Michael Murphy (actor), Michael Murphy. Burton had no interest in making a sequel to ''Batman'', believing that he was creatively restricted by the expectations of W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Tim Burton
Timothy Walter Burton (born August 25, 1958) is an American filmmaker and producer. Known for popularizing Goth subculture, Goth culture in the American film industry, Burton is famous for his Gothic film, gothic horror and dark fantasy films. He has received List of awards and nominations received by Tim Burton, numerous accolades including an Emmy Award as well as nominations for two Academy Awards, a Golden Globe Award and three BAFTA Awards. He was honored with the Venice International Film Festival's Golden Lion for Lifetime Achievement in 2007 and was given the Order of Arts and Letters by Culture Minister of France in 2010. Burton made his directorial film debut with the comedy ''Pee-wee's Big Adventure'' (1985) and gained prominence for ''Beetlejuice'' (1988) and ''Edward Scissorhands'' (1990). Burton also directed the superhero films ''Batman (1989 film), Batman'' (1989) and ''Batman Returns'' (1992); the animated films ''Corpse Bride'' (2005) and ''Frankenweenie (2012 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Screensaver
A screensaver (or screen saver) is a computer program that blanks the display screen or fills it with moving images or patterns when the computer has been idle for a designated time. The original purpose of screensavers was to prevent phosphor screen burn-in, burn-in on Cathode-ray tube, CRT or plasma display, plasma computer monitors (hence the name). Though most modern monitors are not susceptible to this issue (with the notable exception of OLED technology, which has individual pixels vulnerable to burnout), screensaver programs are still used for other purposes. Screensavers are often set up to offer a basic layer of computer security, security by requiring a password to re-access the device. Some screensaver programs also use otherwise-idle computer resources to do useful work, such as processing for volunteer computing projects. As well as computers, modern television operating systems, media players, and other digital entertainment systems may include optional screensavers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Bernard Chazelle
Bernard Chazelle (born November 5, 1955) is a French computer scientist. He is the Eugene Higgins Professor of Computer Science at Princeton University. Much of his work is in computational geometry, where he is known for his study of algorithms, such as linear-time triangulation of a simple polygon, as well as major complexity results, such as lower bound techniques based on discrepancy theory. He is also known for his invention of the soft heap data structure and the most asymptotically efficient known deterministic algorithm for finding minimum spanning trees. Early life Chazelle was born in Clamart, France, the son of Marie-Claire (née Blanc) and Jean Chazelle. He grew up in Paris, France, where he received his bachelor's degree and master's degree in applied mathematics at the École des mines de Paris in 1977. Then, at the age of 21, he attended Yale University in the United States, where he received his PhD in computer science in 1980 under the supervision of David ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
