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Subterranean Architects

An in-depth academic exploration of moles, detailing their unique adaptations, ecological significance, and taxonomic diversity.

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Defining the Mole

Fossorial Mammals

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

Global Distribution

The term "mole" most commonly refers to species within the family Talpidae, named after the Latin word talpa.[2] These true moles inhabit most of North America, Europe (excluding Ireland), and Asia.[3][4] It is important to distinguish them from unrelated animals exhibiting similar lifestyles due to convergent evolution, such as the African golden moles and Australian marsupial moles.

Ecological Role

While often perceived as garden pests, moles contribute positively to soil health through aeration. They also play a role in the ecosystem by consuming invertebrates like slugs and providing a food source for other wildlife.[5][6]

Nomenclature and Terminology

Historical Terms

In Middle English, moles were known as moldwarps. By the Early Modern English period, they were also referred to as mouldywarp or mouldiwarp, terms cognate with similar words in other Germanic languages, such as German Maulwurf, signifying "one who throws soil" or "dirt-tosser".[a][b]

Gendered Terms

Within mole populations, males are referred to as "boars," while females are designated as "sows."

Unique Adaptations

Resilient Respiration

Moles exhibit a remarkable tolerance for high carbon dioxide levels, attributed to a specialized form of hemoglobin in their blood. This hemoglobin possesses a higher affinity for oxygen compared to that of other mammals. Furthermore, moles enhance their oxygen utilization by rebreathing exhaled air, enabling survival in low-oxygen subterranean environments.[9]

The Polydactyl Paw

Moles possess polydactyl forepaws, featuring an extra digit, known as a prepollex, adjacent to the standard thumb. Unlike other digits, this prepollex consists of a single, sickle-shaped bone that develops uniquely during embryogenesis from a transformed wrist sesamoid bone. This trait evolved independently, mirroring the giant panda's thumb, and is species-specific within moles. Research suggests a potential link between androgenic steroids and the development of this digit, possibly relating to sexual dimorphism in moles.[10]

The classification of moles is complex, reflecting their evolutionary history and adaptations:

  • Order: Eulipotyphla (sharing this order with shrews and hedgehogs).
  • Family: Talpidae.
  • Subfamilies and Tribes:
    • Scalopinae (New World moles): Includes tribes like Condylurini (Star-nosed mole) and Scalopini (various North American moles).
    • Talpinae (Old World moles, desmans, shrew moles): Includes tribes like Desmanini (desmans), Talpini (Old World moles), Scaptonychini (Long-tailed mole), Urotrichini (Japanese shrew moles), and Neurotrichini (American shrew mole).
    • Uropsilinae (Asian shrew moles).

It is crucial to note that groups like golden moles (Family Chrysochloridae) and marsupial moles (Order Notoryctemorphia) are entirely unrelated to true moles, despite similar fossorial adaptations, due to convergent evolution.

Dietary Habits

Primary Prey

Moles are primarily omnivores, with their diet heavily reliant on earthworms and other soil-dwelling invertebrates. Their extensive tunnel systems function as effective "worm traps," allowing them to capture prey that falls into the tunnels.[11]

Prey Preservation

Remarkably, moles possess a toxin in their saliva capable of paralyzing earthworms. This allows them to store live prey in specialized underground chambers, known as "larders," for later consumption. Before ingestion, moles meticulously clean the earthworms by squeezing them between their paws to expel gut contents.[12]

Specialized Sensory Abilities

The star-nosed mole (Condylura cristata) is noted for its exceptional speed in detecting, capturing, and consuming food, operating at a pace that surpasses human visual tracking capabilities.[13]

Reproductive Cycles

Mating Season

The breeding season for moles typically spans from February through May. Males actively seek out females by emitting high-pitched vocalizations and excavating new tunnels.[14]

Gestation and Offspring

For the Eastern mole (Scalopus aquaticus), the gestation period is approximately 42 days, with litters of three to five young typically born in March and early April. Townsend's moles mate in February and March, with their two to four offspring born about a month later.[15]

Social Structure

Solitary Existence

Moles are generally considered solitary creatures, interacting primarily for reproductive purposes. While their territories may overlap, individuals typically avoid one another, and males are known to engage in aggressive territorial disputes.[16][17]

Taxonomic Classification

Evolutionary Relationships

Historically classified under the order Insectivora, moles are now placed within the order Eulipotyphla, alongside shrews and hedgehogs, reflecting a more accurate phylogenetic understanding.[18] The family Talpidae encompasses true moles and their close relatives, including shrew moles.

The family Talpidae is structured as follows:

  • Subfamily Scalopinae (New World moles):
    • Tribe Condylurini: Star-nosed mole (Genus Condylura).
    • Tribe Scalopini: Various New World moles (Genera Alpiscaptulus, Parascalops, Scalopus, Scapanulus, Scapanus).
  • Subfamily Talpinae (Old World moles, desmans, shrew moles):
    • Tribe Desmanini: Desmans (Genera Desmana, Galemys).
    • Tribe Talpini: Old World moles (Genera Euroscaptor, Mogera, Parascaptor, Scaptochirus, Talpa).
    • Tribe Scaptonychini: Long-tailed mole (Genus Scaptonyx).
    • Tribe Urotrichini: Japanese shrew moles (Genera Dymecodon, Urotrichus).
    • Tribe Neurotrichini: American shrew mole (Genus Neurotrichus).
  • Subfamily Uropsilinae (Asian shrew moles): Genus Uropsilus.

Furthermore, distinct groups like the golden moles (Family Chrysochloridae) and marsupial moles (Order Notoryctemorphia) are not closely related to true moles, despite similar fossorial adaptations, due to convergent evolution.

The Value of Mole Pelts

Unique Texture and Properties

Mole pelts are distinguished by their exceptionally short, dense, velvety fur, which lacks a directional nap. This unique characteristic facilitates effortless backward movement within burrows. The resulting leather is remarkably soft and supple.[19]

Historical Fashion Trend

A fashion trend for mole fur garments was initiated by Queen Alexandra, consort of Edward VII, transforming a pest problem in Scotland into a significant industry. The natural taupe color of the pelts readily accepts dyeing, making them versatile for various fashion applications. The term "moleskin" persists today, referring to a durable cotton fabric.

Moles as Pests and Their Management

Agricultural and Horticultural Impacts

In certain regions, moles are classified as agricultural pests. Concerns include soil contamination of silage, rendering it unpalatable to livestock; the creation of molehills that reduce pasture size and yield; damage to agricultural machinery from exposed stones; disruption of plant roots; and the facilitation of weed invasion. Additionally, tunnels can compromise drainage systems and watercourses. Other species may exploit mole tunnels.[20]

Various methods are employed for mole control:

  • Trapping: Traditional mole traps are commonly used.
  • Chemical Repellents/Poisons: Historically, substances like calcium carbide (producing acetylene gas) and strychnine were used. Modern methods include aluminum phosphide tablets (releasing phosphine gas) and high-grade nitrogen gas, which is considered environmentally benign.
  • Repellents: Materials such as cat litter and blood meal are sometimes used to deter moles.
  • Physical Methods: Devices exist to trap moles within their tunnels, often identified by visible movement.
  • Humane Options: Live traps allow for the capture and relocation of moles.
  • Non-Lethal Management: In domestic settings, the visual impact of molehills can be managed by removing the soil, allowing moles to continue their subterranean existence undisturbed. However, shallow tunnels can collapse, creating unsightly furrows.

Moles in Archaeology

Unearthing the Past

Moles inadvertently assist archaeologists by bringing small artifacts, such as pottery sherds, to the surface through their digging activities. Examination of molehills can therefore provide valuable evidence of past human habitation.[22]

Consumption of Mole Meat

Historical Accounts

Historical accounts, such as those from William Buckland, a naturalist known for consuming a wide variety of animals, suggest that mole meat is considered unpalatable, with Buckland describing its taste as vile.[21]

References

  1. Kott, Ondล™ej; Sumbera, Radim; Nemec, Pavel (2010). Iwaniuirst, Andrew (ed.). "Light Perception in Two Strictly Subterranean Rodents: Life in the Dark or Blue?". PLOS ONE. 5 (7): e11810. Bibcode:2010PLoSO...511810K. doi:10.1371/journal.pone.0011810. PMC 2911378. PMID 20676369.
  2. Riddle, Joseph Edmond (1838). A Complete English-Latin Dictionary, for the Use of Colleges and Schools. London: Longman, Orme, Brown, Green and Longmans, Paternoster-Row; and John Murray, Albemarle Street. p. 193.
  3. "Ulster wildlife". Retrieved 23 August 2025.
  4. Campbell, Kevin. "Mole Distribution Maps". University of Manitoba. Archived from the original on 24 March 2010. Retrieved 11 March 2010.
  5. Arlton, A.V. (1936). "An Ecological Study of the Mole". Journal of Mammalogy. 17 (4): 349โ€“371. doi:10.2307/1374401. JSTOR 1374401.
  6. Streitberger, Merle (2016). Ants and Moles as Ecosystem Engineers: The Role of Small-scale Disturbance for Biodiversity in Central European Grasslands. Osnabrรผck.
  7. Roper, William (1822) [1626]. "p.61". In Singer, S.W. (ed.). The mirrour of vertue in worldly greatnes; or the life of Syr T. More (The life of Sir Thomas More by his son-in-law William Roper, Esq. ed.). London: press of C. Whittingham. Retrieved 23 January 2017.
  8. Rackham, Oliver, The Illustrated History of the Countryside page 130 (quoting J. Seddon, The boke of surveying and improvments [sic]) ISBN 0-297-84335-4
  9. "Secret of how moles breathe underground revealed". The Telegraph. 20 July 2010. Archived from the original on 23 July 2010. Retrieved 19 August 2016.
  10. "How the mole got its twelve fingers". University of Zurich. 12 July 2011. Archived from the original on 23 July 2011. Retrieved 17 July 2011.
  11. "Moles". Pest-management.co.uk. Archived from the original on 1 May 2009. Retrieved 19 August 2016.
  12. Attenborough, David (2002). The life of mammals. London: BBC. p. 44. ISBN 0563534230.
  13. Salisbury, David F. (2 February 2005). "Marsh-dwelling mole gives new meaning to the term 'fast food'". EurekAlert. Archived from the original on 16 August 2016. Retrieved 19 August 2016.
  14. "Moles their biology and control". Icwdm.org. Archived from the original on 27 September 2013. Retrieved 12 July 2013.
  15. Scapanus townsendii Archived 13 July 2013 at the Wayback Machine. California Department of Fish and Game
  16. "Living with wildlife: Moles | Washington Department of Fish & Wildlife". wdfw.wa.gov. Retrieved 19 May 2025.
  17. Kowalski, Kazimierz (1976). Mammals: An Outline of Thierology (Ssaki. Zarys teriologii). Panstwowe Wydawnictwo Naukowe. p. 321.
  18. Mouchaty, Suzette K.; Gullberg, Anette; Janke, Axel; Arnason, Ulfur (2000). "The Phylogenetic Position of the Talpidae Within Eutheria Based on Analysis of Complete Mitochondrial Sequences". Mol Biol Evol. 17 (1): 60โ€“67. doi:10.1093/oxfordjournals.molbev.a026238. PMID 10666706.
  19. "Furs types in brief". furcommission.com. Archived from the original on 21 July 2011.
  20. "How to get rid of moles". Extermine.com. 2004. Archived from the original on 26 April 2012. Retrieved 17 July 2011.
  21. Howard, Martin (1 April 2010). "Why we need eccentricity". The Guardian. London. Archived from the original on 24 March 2014. Retrieved 13 May 2010.
  22. "Moles take up Roman archaeology". BBC News. 3 May 2013. Retrieved 16 January 2023.
  23. "Moles take up Roman archaeology". BBC News. 3 May 2013. Retrieved 16 January 2023.
  24. "Moles take up Roman archaeology". BBC News. 3 May 2013. Retrieved 16 January 2023.

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References

References

A full list of references for this article are available at the Mole (animal) Wikipedia page

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Important Notice

This document has been generated by an advanced AI model, drawing upon publicly available data from Wikipedia. It is intended solely for educational and informational purposes, presented in an academic style suitable for higher education students. While efforts have been made to ensure accuracy and comprehensiveness based on the provided source material, the content may not be exhaustive or entirely up-to-date.

This is not professional zoological or ecological advice. The information herein should not substitute consultation with qualified biologists, ecologists, or wildlife management professionals. Always consult with experts for specific applications or concerns related to wildlife, pest management, or conservation.

The creators of this educational resource are not liable for any errors, omissions, or actions taken based on the information presented.