A molehill (or mole-hill, mole mound) is a conical mound of loose soil raised by small burrowing mammals, including moles, but also similar animals such as mole-rats, and voles. The word is first recorded in the first half of the 15th century. [1] Formerly the hill was known as a 'wantitump', a word still in dialect use for centuries afterwards. [2]
The phrase "making a mountain out of a molehill" is commonly used metaphorically to mean "to exaggerate a minor problem".
Molehills are waste material which come from digging or repairing burrows, and so are usually found where the animal is establishing new burrows, or where existing ones are damaged (for example by the weight of grazing livestock). Where moles burrow beneath the roots of trees or shrubs, the roots support the tunnel, and molehills are less common, and so even a dense population of the animals may be inconspicuous in these places.
Molehills are often the only sign to indicate the presence of the animal and recording their presence may be the most reliable way to determine the number of moles in an area. [3] Commonly they occur in lines along the route of the burrow, but in some cases they may not be directly above the burrow itself but at the ends of short side-tunnels. The mole runs vary in depth from surface runs only a few inches deep, to main runs, some 12 to 18 inches deep [4]
The disturbance of the soil brings an important benefit by aerating and tilling it, adding to its fertility. [5] Molehills are therefore sometimes used as a source of good soil for use in gardening and are particularly valued by some practitioners of permaculture for fine potting soil. [6] However, they may cause damage to gardens and functional areas of grass such as pasture land, and they represent a minor safety hazard. King William III of England is recorded as dying from complications after he was thrown when his horse stumbled on one. [7]
In locations where mole-hills are not desired, the moles may be killed, or deterrent plants like caper spurge or the related castor bean plant can be planted. The fresh molehills can also be removed carefully as soon as they appear. This leaves the animals and their galleries undamaged and thus reduces the need for the moles to make further molehills when they clear earth out of the tunnels. [8]
Moles are small mammals adapted to a subterranean lifestyle. They have cylindrical bodies, velvety fur, very small, inconspicuous eyes and ears, reduced hindlimbs, and short, powerful forelimbs with large paws adapted for digging.
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.
The European mole is a mammal of the order Eulipotyphla. It is also known as the common mole and the northern mole.
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.
Pocket gophers, commonly referred to simply as gophers, are burrowing rodents of the family Geomyidae. The roughly 41 species are all endemic to North and Central America. They are commonly known for their extensive tunneling activities and their ability to destroy farms and gardens.
The blesmols, also known as mole-rats, or African mole-rats, are burrowing rodents of the family Bathyergidae. They represent a distinct evolution of a subterranean life among rodents much like the pocket gophers of North America, the tuco-tucos in South America, or the Spalacidae from Eurasia.
The smooth-toothed pocket gophers, genus Thomomys, are so called because they are among the only pocket gophers without grooves on their incisors. They are also called the western pocket gophers because they are distributed in western North America. They are considered distinct enough from other pocket gophers to be recognized as a separate subfamily or tribe.
A fossorial animal is one adapted to digging which lives primarily, but not solely, underground. Some examples are badgers, naked mole-rats, clams, meerkats, and mole salamanders, as well as many beetles, wasps, bees and spiders.
Soil biology is the study of microbial and faunal activity and ecology in soil. Soil life, soil biota, soil fauna, or edaphon is a collective term that encompasses all organisms that spend a significant portion of their life cycle within a soil profile, or at the soil-litter interface. These organisms include earthworms, nematodes, protozoa, fungi, bacteria, different arthropods, as well as some reptiles, and species of burrowing mammals like gophers, moles and prairie dogs. Soil biology plays a vital role in determining many soil characteristics. The decomposition of organic matter by soil organisms has an immense influence on soil fertility, plant growth, soil structure, and carbon storage. As a relatively new science, much remains unknown about soil biology and its effect on soil ecosystems.
The Damaraland mole-rat, Damara mole rat or Damaraland blesmol, is a burrowing rodent found in southern Africa. Along with the smaller, less hairy, naked mole rat, it is a species of eusocial mammal.
The southeastern pocket gopher is a species of pocket gopher that is native to the southeastern United States. It occurs in Alabama, Georgia, and Florida, where it is the only pocket gopher.
The Cape mole-rat is a species of mole-rat endemic to South Africa. It is the only extant species currently described as belonging to the genus Georychus.
The rough-haired golden mole is a species of mammal that live mostly below ground. They have shiny coats of dense fur and a streamlined, formless appearance. They have no visible eyes or ears; in fact, they are blind - the small eyes are covered with hairy skin. The ears are small and are hidden in the animal's fur.
The Cape dune mole-rat is a species of solitary burrowing rodent in the family Bathyergidae. It is endemic to South Africa and named for the Cape of Good Hope.
The lesser bamboo rat is a species of rodent in the family Spalacidae. It is monotypic within the genus Cannomys. It is found in Bangladesh, Bhutan, Cambodia, China, India, Myanmar, Nepal, and Thailand.
The Chinese zokor is a species of rodent in the family Spalacidae. It is endemic to China, ranging from Qinghai Province eastwards to Beijing in steppe and alpine grasslands. Henri Milne-Edwards first described it in 1867. Eradication programs in the 1990s in Qinghai Province resulted in a population decline to less than a third of the former population. It is considered common and has been assessed as Least Concern by IUCN.
The King African mole-rat, King mole-rat, or Alpine mole-rat, is a burrowing rodent in the genus Tachyoryctes of family Spalacidae. It only occurs high on Mount Kenya, where it is common. Originally described as a separate species related to Aberdare Mountains African mole-rat, in 1910, some classify it as the same species as the East African mole-rat,.
Heuweltjies are large mounds above or near the surface of the landscape, a type of soil surface feature that occurs widely in the south-western Cape of South Africa. Their formation has been the subject of a wide range of speculation and of debate.
Baird's pocket gopher or the Louisiana pocket gopher is a species of pocket gopher that is native to the southern United States. In total, there are three almost identical species of eastern pocket gopher; Geomys attwateri, G. bursarius, and G. breviceps. G. breviceps is larger in size, G. attwateri is medium-sized and G. bursarius is a bit smaller. Other than by size variation they are not identifiable by external features. Baird's pocket gophers are small rodents with most of their weight on the top half of their bodies.
Gryllotalpa orientalis is a species of mole cricket in the family Gryllotalpidae, commonly known as the oriental mole cricket. It is found in much of Asia and Australasia. At one time, this species was misidentified as G. africana and thought to have a widespread distribution in both Africa and Asia, but in the 1980s, G. orientalis was recognised as a separate species. It is a polyphagous pest, damaging crops by gnawing their roots.