Mole (animal)

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A European mole Kret mole.jpg
A European mole
Various moles Talpidae family pictures.png
Various moles

Moles are small, subterranean mammals. They have cylindrical bodies, velvety fur, very small, inconspicuous eyes and ears, [1] reduced hindlimbs, and short, powerful forelimbs with large paws adapted for digging.

Contents

The word "mole" most commonly refers to many species in the family Talpidae (which are named after the Latin word for mole, talpa). [2] True moles are found in most parts of North America, Europe and Asia. [3] Other mammals referred to as moles include the African golden moles and the Australian marsupial moles, which have a similar ecology and lifestyle to true moles, but are unrelated.

Moles may be viewed as pests to gardeners, but they provide positive contributions to soil, gardens, and ecosystems, including soil aeration, feeding on slugs and small creatures that eat plant roots, and providing prey for other wildlife. They eat earthworms and other small invertebrates in the soil. [4] [5]

Terminology

In Middle English, moles were known as moldwarps. The expression "don't make a mountain out of a molehill" (which means "exaggerating problems") was first recorded in Tudor times. [6] By the era of Early Modern English, the mole was also known in English as mouldywarp or mouldiwarp, [i] a word having cognates in other Germanic languages such as German (Maulwurf), [7] and Danish, Norwegian, Swedish and Icelandic (muldvarp, moldvarp, mullvad, moldvarpa), where muld/mull/mold refers to soil and varp/vad/varpa refers to throwing, hence "one who throws soil" or "dirt-tosser".

Male moles are called "boars"; females are called "sows".

Characteristics

Underground breathing

Moles have been found to tolerate higher levels of carbon dioxide than other mammals, because their blood cells have a special form of hemoglobin that has a higher affinity to oxygen than other forms. In addition, moles use oxygen more effectively by reusing the exhaled air, and can survive in low-oxygen environments such as burrows. [8]

Extra thumbs

Mole paw Talpa europaea MHNT pate.jpg
Mole paw

Moles have polydactyl forepaws: each has an extra thumb (also known as a prepollex) next to the regular thumb. While the mole's other digits have multiple joints, the prepollex has a single, sickle-shaped bone that develops later and differently from the other fingers during embryogenesis from a transformed sesamoid bone in the wrist, independently evolved but similar to the giant panda thumb. This supernumerary digit is species-specific, as it is not present in shrews, the mole's closest relatives. Androgenic steroids are known to affect the growth and formation of bones, and a connection is possible between this species-specific trait and the male genital apparatus in female moles of many mole species (gonads with testicular and ovary tissues). [9]

Diet

Moles are omnivores, but their diet primarily consists of earthworms and other small invertebrates found in the soil. The mole runs are in reality "worm traps", the mole sensing when a worm falls into the tunnel and quickly running along to kill and eat it. [10] Because their saliva contains a toxin that can paralyze earthworms, moles are able to store their still-living prey for later consumption. They construct special underground "larders" for just this purpose; researchers have discovered such larders with over a thousand earthworms in them. Before eating earthworms, moles pull them between their squeezed paws to force the collected earth and dirt out of the worm's gut. [11]

The star-nosed mole can detect, catch and eat food faster than the human eye can follow. [12]

Breeding

Breeding season for a mole depends on species, but is generally from February through May. Males search for females by letting out high-pitched squeals and tunneling through foreign areas.

The gestation period of the Eastern (North America) mole (Scalopus aquaticus) is approximately 42 days. Three to five young are born, mainly in March and early April. [13] Townsend's moles mate in February and March, and the 2–4 young are born in March and April after a gestation period of about 1 month. [14]

Social structure

Moles are allegedly solitary creatures, coming together only to mate.[ citation needed ] Territories may overlap, but moles avoid each other and males may fight fiercely if they meet. [15]

Classification

Uropsilus Uropsilus1sm.jpg
Uropsilus
Northern broad-footed mole Scapanus latimanus2.jpg
Northern broad-footed mole

The family Talpidae contains all the true moles and some of their close relatives. Those species called "shrew moles" represent an intermediate form between the moles and their shrew ancestors, and as such may not be fully described by the article.

Moles were traditionally classified in the order Insectivora, but that order has since been abandoned because it has been shown to not be monophyletic. Moles are now classified with shrews and hedgehogs, in the more narrowly defined order Eulipotyphla. [16]

Other "moles"

Many groups of burrowing animals (pink fairy armadillos, tuco-tucos, mole rats, mole crickets, pygmy mole crickets, and mole crabs) have independently developed close physical similarities with moles due to convergent evolution; two of these are so similar to true moles, they are commonly called and thought of as "moles" in common English, although they are completely unrelated to true moles or to each other. These are the golden moles of southern Africa and the marsupial moles of Australia. While difficult to distinguish from each other, they are most easily distinguished from true moles by shovel-like patches on their noses, which they use in tandem with their abbreviated forepaws to swim through sandy soils.

Golden moles

The golden moles belong to the same branch on the phylogenetic tree as the tenrecs, called Tenrecomorpha, which, in turn, stem from a main branch of placental mammals called the Afrosoricida. This means that they share a closer common ancestor with such existing afrosoricids as elephants, manatees and aardvarks than they do with other placental mammals, such as true Talpidae moles.

Marsupial moles

A marsupial mole Kret workowaty.jpg
A marsupial mole

As marsupials, these moles are even more distantly related to true talpid moles than golden moles are, both of which belong to the Eutheria, or placental mammals. This means that they are more closely related to such existing Australian marsupials as kangaroos or koalas, and even to a lesser extent to American marsupials, such as opossums, than they are to placental mammals, such as golden or Talpidae moles.

Class Mammalia

Interaction with humans

Pelts

Advertisement in Illustrated Sporting and Dramatic News, 1921 Debenham and Freebody ad 1921 1 ISaDN.jpg
Advertisement in Illustrated Sporting and Dramatic News , 1921

Moles' pelts have a velvety texture not found in surface animals. Surface-dwelling animals tend to have longer fur with a natural tendency for the nap to lie in a particular direction, but to facilitate their burrowing lifestyle, mole pelts are short and very dense and have no particular direction to the nap. This makes it easy for moles to move backwards underground, as their fur is not "brushed the wrong way". The leather is extremely soft and supple. Queen Alexandra, the wife of Edward VII of the United Kingdom, ordered a mole-fur garment to start a fashion that would create a demand for mole fur, thereby turning what had been a serious pest problem in Scotland into a lucrative industry for the country. Hundreds of pelts are cut into rectangles and sewn together to make a coat. The natural color is taupe, (derived from the French noun taupe meaning mole) but it is readily dyed any color. [17]

The term "moleskin" for a tough cotton fabric is in common use today.

Pest status: extermination and humane options

Molehills in eastern Bohemia Krtek1.jpg
Molehills in eastern Bohemia

Moles are considered agricultural pests in some countries, while in others, such as Germany, they are a protected species, but may be killed with a permit. Problems cited as caused by moles include contamination of silage with soil particles, making it unpalatable to livestock, the covering of pasture with fresh soil reducing its size and yield, damage to agricultural machinery by the exposure of stones, damage to young plants through disturbance of the soil, weed invasion of pasture through exposure of freshly tilled soil, and damage to drainage systems and watercourses. Other species such as weasels and voles may use mole tunnels to gain access to enclosed areas or plant roots.

Moles burrow and raise molehills, killing parts of lawns. They can undermine plant roots, indirectly causing damage or death. Moles do not eat plant roots. [18]

A mole trap Op scherp staande mollenklem.jpg
A mole trap

Moles are controlled with traps such as mole-catchers, smoke bombs, and poisons such as calcium carbide, which produces acetylene gas to drive moles away. Strychnine was also used for this purpose in the past. The most common method now is Phostoxin or Talunex tablets. They contain aluminium phosphide and are inserted in the mole tunnels, where they turn into phosphine gas (not be confused with phosgene gas). More recently, high-grade nitrogen gas has proven effective at killing moles, with the added advantage of having no polluting effect to the environment. [18]

Dead moles traditionally hung on a fence after being caught. Dead moles on display hung on a fence.jpg
Dead moles traditionally hung on a fence after being caught.

Other common defensive measures include cat litter and blood meal, to repel the mole, or smoking its burrow. Devices are also sold to trap the mole in its burrow, when one sees the "mole hill" moving and therefore knows where the animal is, and then stabbing it.

Other humane options are also possible including humane traps that capture the mole alive so it may be transported elsewhere. [18] In many contexts including ordinary gardens, the damage caused by moles to lawns is mostly visual, and it is possible instead of extermination to simply remove the earth of the molehills as they appear, leaving their permanent galleries for the moles to continue their existence underground. [18] However, when the tunnels are near the surface in soft ground or after heavy rain, they may collapse, leaving (small) unsightly furrows in the lawn.

Meat

William Buckland, known for eating every animal he could, opined that mole meat tasted vile. [19]

Archaeology

Moles can inadvertently help archaeologists by bringing small artifacts to the surface through their digging. By examining molehills for sherds and other small objects, archaeologists can find evidence of human habitation. [20]

See also

Notes

  1. Also Mouldwarp, Moldiwarp, Moldywarp.

Related Research Articles

<span class="mw-page-title-main">Insectivora</span> Now abandoned biological grouping

The order Insectivora is a now-abandoned biological grouping within the class of mammals. Some species have now been moved out, leaving the remaining ones in the order Eulipotyphla within the larger clade Laurasiatheria, which makes up one of the basal clades of placental mammals.

<span class="mw-page-title-main">Marsupial mole</span> Genus of marsupials

Marsupial moles, the Notoryctidae family, are two species of highly specialized marsupial mammals that are found in the Australian interior. They are small burrowing marsupials that anatomically converge on fossorial placental mammals, such as extant golden moles (Chrysochloridae) and extinct epoicotheres (Pholidota). The species are:

<span class="mw-page-title-main">Eulipotyphla</span> Order of mammals

Eulipotyphla is an order of mammals comprising the Erinaceidae ; Solenodontidae (solenodons); Talpidae ; and Soricidae families.

<span class="mw-page-title-main">Golden mole</span> Monotypic family of mammals

Golden moles are small insectivorous burrowing mammals endemic to Sub-Saharan Africa. They comprise the family Chrysochloridae and as such they are taxonomically distinct from the true moles, family Talpidae, and other mole-like families, all of which, to various degrees, they resemble as a result of evolutionary convergence. There are 21 species. Some are relatively common, whereas others are rare and endangered.

<span class="mw-page-title-main">Afrosoricida</span> Order of mammals

The clade Afrosoricida contains the golden moles of Southern Africa, the otter shrews of equatorial Africa and the tenrecs of Madagascar. These three groups of small mammals were for most of the 19th and 20th centuries regarded as a part of the Insectivora or Lipotyphla, but both of those groups, as traditionally used, are polyphyletic.

<span class="mw-page-title-main">Talpidae</span> Family of small insectivorous mammals

The family Talpidae includes the true moles who are small insectivorous mammals of the order Eulipotyphla. Talpids are all digging animals to various degrees: moles are completely subterranean animals; shrew moles and shrew-like moles somewhat less so; and desmans, while basically aquatic, excavate dry sleeping chambers; whilst the quite unique star-nosed mole is equally adept in the water and underground. Talpids are found across the Northern Hemisphere of Eurasia and North America, and range as far south as the montane regions of tropical Southeast Asia.

<span class="mw-page-title-main">Talpinae</span> Subfamily of mammals

The subfamily Talpinae, sometimes called "Old World moles" or "Old World moles and relatives", is one of three subfamilies of the mole family Talpidae, the others being the Scalopinae, or New World moles, and the Uropsilinae, or shrew-like moles.

<span class="mw-page-title-main">American shrew mole</span> Species of mammal

The American shrew mole is the smallest species of mole. It is the only living member of the genus Neurotrichus and the tribe Neurotrichini. It is also known as Gibb's shrew mole and least shrew mole. It is not closely related to the Asian shrew mole. The reason that it is called a "shrew mole" instead of being called either a "shrew" or a "mole" is because of its fur, which is a characteristic of shrews and its large head and heavy dentition, which is characteristic of moles.

<span class="mw-page-title-main">Hairy-tailed mole</span> Species of mammal

The hairy-tailed mole, also known as Brewer's mole, is a medium-sized North American mole. It is the only member of the genus Parascalops. The species epithet breweri refers to Thomas Mayo Brewer, an American naturalist.

<span class="mw-page-title-main">Soricomorpha</span> Formerly used suborder of mammals

Soricomorpha is a formerly used taxon within the class of mammals. In the past it formed a significant group within the former order Insectivora. However, Insectivora was shown to be polyphyletic and various new orders were split off from it, including Afrosoricida, Macroscelidea, and Erinaceomorpha, with the four remaining extant and recent families of Soricomorpha shown here then being treated as a separate order. Insectivora was left empty and disbanded.

<span class="mw-page-title-main">Northern marsupial mole</span> Species of marsupial

The northern marsupial mole or kakarratul is a marsupial in the family Notoryctidae, an endemic animal of arid regions of Central Australia. It lives in the loose sand of dunes and river plains in the desert, spending nearly its entire life beneath ground. The facial features are reduced or absent; their small and strong bodies, weighing little more than 30 grams, are extremely specialised in moving through sand in search of prey. The species is elusive and it is one of the most poorly understood mammals of Australia.

<i>Amblysomus</i> Genus of mammals

Amblysomus is a genus of the golden mole family, Chrysochloridae, comprising five species of the small, insect-eating, burrowing mammals endemic to Southern Africa. All five species can be found in South Africa and some are also found in Eswatini and Lesotho.

<span class="mw-page-title-main">Urotrichini</span> Tribe of mammals

Urotrichini is a tribe of the mole family, and consists of Japanese and American shrew-moles. They belong to the Old World moles and relatives branch of the mole family (Talpidae). There are only two species, each of which represents its own genus. The name "shrew-moles" refers to their morphological resemblance to shrews, while generally being thought of as "true moles". The species are the Japanese shrew mole, True's shrew mole and American shrew mole.

<span class="mw-page-title-main">Scalopinae</span> Subfamily of mammals

The Scalopinae, or New World moles, are one of three subfamilies of the family Talpidae, which consists of moles and mole-like animals; the other two subfamilies being the Old World talpids and the Chinese shrew-like moles (Uropsilinae). The Scalopinae are the only Talpidae subfamily to consist entirely of undisputed moles and no mole-like close relatives such as shrew-moles or desmans.

<span class="mw-page-title-main">Ognev's mole</span> Species of mammal

Ognev's mole is a species of mammal in the family Talpidae. It occurs in the southeastern coastal area of the Black Sea from northeastern Turkey to Georgia. It inhabits different habitats associated with moist soils in lowland areas. Little information is available about its life history.

<span class="mw-page-title-main">Talysch mole</span> Species of mammal

The Talysch mole is a species of mammal in the family Talpidae. It is a small member of the family, which outwardly resembles the Levant mole, but is genetically closer to Père David's mole. It is common on the southwest coast of the Caspian Sea, from southern of Azerbaijan through most of the north of Iran. The habitat includes temperate rainforests and scrub areas. There is little information about the life history of the Talysch mole. It was described in 1945, but had long been considered a subspecies of various other Eurasian moles, and was only recognized as a distinct species in the mid-2010s. No surveys have been carried out to quantify the status of the species.

References

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