Homing (biology)
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Homing is the inherent ability of an
animal Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage ...
to
navigate Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, ...
towards an original
location In geography, location or place are used to denote a region (point, line, or area) on Earth's surface or elsewhere. The term ''location'' generally implies a higher degree of certainty than ''place'', the latter often indicating an entity with an ...
through unfamiliar areas. This location may be either a home territory, or a breeding spot.


Uses

Homing abilities can be used to find the way back to home in a
migration Migration, migratory, or migrate may refer to: Human migration * Human migration, physical movement by humans from one region to another ** International migration, when peoples cross state boundaries and stay in the host state for some minimum le ...
. It is often used in reference to going back to a breeding spot seen years before, as in the case of
salmon Salmon () is the common name for several commercially important species of euryhaline ray-finned fish from the family Salmonidae, which are native to tributaries of the North Atlantic (genus '' Salmo'') and North Pacific (genus '' Onco ...
. Homing abilities can also be used to go back to familiar territory when displaced over long distances, such as with the
red-bellied newt The red-bellied newt (''Taricha rivularis'') is a newt that is native to coastal woodlands in northern California and is terrestrial for most of its life. Description When full grown, the red-bellied newt measures between from its nose to its ...
.


True navigation

Some animals use true
navigation Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation ...
for their homing. This means in familiar areas they will use landmarks such as roads, rivers or mountains when flying, or islands and other landmarks while swimming. However, this only works in familiar territory.
Homing pigeon The homing pigeon, also called the mail pigeon or messenger pigeon, is a variety of domestic pigeons (''Columba livia domestica'') derived from the wild rock dove, selectively bred for its ability to find its way home over extremely long dist ...
s, for example, will often navigate using familiar
landmark A landmark is a recognizable natural or artificial feature used for navigation, a feature that stands out from its near environment and is often visible from long distances. In modern use, the term can also be applied to smaller structures or f ...
s, such as roads.BBC News: Pigeons reveal map-reading secret
/ref>
Sea turtle Sea turtles (superfamily Chelonioidea), sometimes called marine turtles, are reptiles of the order Testudines and of the suborder Cryptodira. The seven existing species of sea turtles are the flatback, green, hawksbill, leatherback, loggerhe ...
s will also use landmarks to orient themselves.Avens, L., (2003) "Homing Behavior, Navigation, and Orientation of Juvenile Sea Turtles

/ref>


Magnetic orientation

Many animals use
magnetic Magnetism is the class of physical attributes that are mediated by a magnetic field, which refers to the capacity to induce attractive and repulsive phenomena in other entities. Electric currents and the magnetic moments of elementary particl ...
orientation based on the
Earth's magnetic field Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun. The magneti ...
to find their way home. This is usually used together with other methods, such as a sun compass, as in
bird migration Bird migration is the regular seasonal movement, often north and south along a flyway, between breeding and wintering grounds. Many species of bird migrate. Migration carries high costs in predation and mortality, including from hunting b ...
and in the case of turtles. This is also commonly used when no other methods are available, as in the case of
lobster Lobsters are a family (Nephropidae, synonym Homaridae) of marine crustaceans. They have long bodies with muscular tails and live in crevices or burrows on the sea floor. Three of their five pairs of legs have claws, including the first pair, ...
s, which live underwater, and
mole rat Mole-rat or mole rat can refer to several groups of burrowing Old World rodents: * Bathyergidae, a family of about 20 hystricognath species in six genera from Africa also called blesmols. *'' Heterocephalus glaber'', the naked mole-rat. * Spalaci ...
s, which home through their
burrow An Eastern chipmunk at the entrance of its burrow A burrow is a hole or tunnel excavated into the ground by an animal to construct a space suitable for habitation or temporary refuge, or as a byproduct of locomotion. Burrows provide a form of s ...
s.


Celestial orientation

Celestial orientation, navigation using the stars, is commonly used for homing. Displaced marbled newts, for example, can only home when stars are visible.


Olfaction

There is evidence that
olfaction The sense of smell, or olfaction, is the special sense through which smells (or odors) are perceived. The sense of smell has many functions, including detecting desirable foods, hazards, and pheromones, and plays a role in taste. In humans, ...
, or smell, is used in homing with several salamanders, such as the
red-bellied newt The red-bellied newt (''Taricha rivularis'') is a newt that is native to coastal woodlands in northern California and is terrestrial for most of its life. Description When full grown, the red-bellied newt measures between from its nose to its ...
. Olfaction is also necessary for the homing of
salmon Salmon () is the common name for several commercially important species of euryhaline ray-finned fish from the family Salmonidae, which are native to tributaries of the North Atlantic (genus '' Salmo'') and North Pacific (genus '' Onco ...
.


Topographic memory

Topographic memory, memory of the contours surrounding the destination, is one common method for navigation. This is mainly used by animals with less intelligence, such as molluscs.
Limpet Limpets are a group of aquatic snails that exhibit a conical gastropod shell, shell shape (patelliform) and a strong, muscular foot. Limpets are members of the class Gastropoda, but are polyphyletic, meaning the various groups called "limpets" ...
s use this to find their way back to the home scrape; although whether this is true homing has been disputed.Villee, C., and Groody, T., (1940) ''American Midland Naturalist''; 24(1):190–204


See also

* Natal homing * Philopatry *
Homing endonuclease gene The homing endonucleases are a collection of endonucleases encoded either as freestanding genes within introns, as fusions with host proteins, or as self-splicing inteins. They catalyze the hydrolysis of genomic DNA within the cells that synthes ...


References

{{DEFAULTSORT:Homing (Biology) Behavior Animal migration