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During migration, common nighthawks may travel 2,500 to 6,800 kilometres (1,600 to 4,200 mi). They migrate by day or night in loose flocks, frequently numbering in the thousands; [6] flocks have not been observed with a visible leader. The enormous distance travelled between breeding grounds and wintering range is one of the North America's ...
Karl von Frisch (1953) discovered that honey bee workers can navigate, and indicate the range and direction to food to other workers with a waggle dance.. In 1873, Charles Darwin wrote a letter to Nature magazine, arguing that animals including man have the ability to navigate by dead reckoning, even if a magnetic 'compass' sense and the ability to navigate by the stars is present: [2]
Migration is the regular seasonal movement, often north and south, undertaken by many species of birds. Migration is marked by its annual seasonality and movement between breeding and non-breeding areas. [16] Nonmigratory bird movements include those made in response to environmental changes including in food availability, habitat, or weather.
[2] [3] [4] As such, there is no simple accepted definition of migration. [5] One of the most commonly used definitions, proposed by the zoologist J. S. Kennedy [ 6 ] is Migratory behavior is persistent and straightened-out movement effected by the animal's own locomotory exertions or by its active embarkation on a vehicle.
The Passeriformes contains 5,000 or so species [1] [2] found all over the world, in which the vocal organ typically is developed in such a way as to produce a diverse and elaborate bird song. Songbirds form one of the two major lineages of extant perching birds (~4,000 species), the other being the Tyranni (~1,000 species), which are most ...
However, within the inner sublayer of the intermediate gray layer (InGi) there were two or three clusters of cells that respond in a more specific manner. The more time the mole rats were exposed to a magnetic field, the greater the immediate early gene expression within the InGi. [66] Magnetic fields appear to play a role in bat orientation.
Diel vertical migration (DVM), also known as diurnal vertical migration, is a pattern of movement used by some organisms, such as copepods, living in the ocean and in lakes. The adjective "diel" ( IPA : / ˈ d aɪ . ə l / , / ˈ d iː . əl / ) comes from Latin : diēs , lit.
Songbird: Rare Tracks & Forgotten Gems is a 2007 box set of songs personally selected by Emmylou Harris: "I've selected not greatest hits, but personal favorites: that, with a few exceptions-have never appeared on any other compilations, but were important gems in the string of pearls that each album strives to become.