European mole

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European mole
Ma

Least Concern  (IUCN 3.1)[2]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Eulipotyphla
Family: Talpidae
Genus: Talpa
Species:
T. europaea
Binomial name
Talpa europaea
European mole range
Preserved skull (1964)

The European mole (Talpa europaea) is a mammal of the order Eulipotyphla. It is also known as the common mole and the northern mole.[3]

This

mice and shrews. Its saliva contains toxins which paralyze earthworms in particular.[4]

Taxonomy

The Aquitanian mole (T. aquitania) was formerly considered conspecific, but was described as a distinct species in 2017.

Distribution

The European mole has a wide range throughout Europe and westernmost Asia, being found as far north as the United Kingdom and southern Scandinavia, as far south as northern Greece, and as far east as western Siberia. It is the only mole species in most of this range. The Loire River in France was thought to form the western barrier to the species' range, separating it from the Aquitanian mole, but studies indicate that while this is largely true, it is not a strict barrier, as member of either species have been found on opposite sides of the river, likely making them sympatric in at least some places.[5]

Description

Skull of a European mole

The European mole has a cylindrical body and is 11 to 16 cm (4+12 to 6+12 in) long, weighing 70 to 130 g (2+12 to 4+12 oz).[6] Females are typically smaller than males. The eyes are small and hidden behind fur, while the ears are just small ridges in the skin. The fur is usually dark grey, but the actual range of colors is larger, as due to the subterranean habits there is no disadvantage in having off-colored fur. European moles with white, light grey, tan, taupe, and black fur have all been reported.[citation needed]

Habitat

While moles are typically found in tunnel systems, the European mole is not exclusively an underground dweller. In the spring and early summer when the young moles leave their mothers' burrows they must find new territories. This forces them to leave their burrows and they can either make new tunnel systems or enter existing systems. In the summer time, however, they are likely to burrow much more superficially. The superficial burrowing could be due in part to the soil that is much harder, which makes burrowing a greater challenge.[7]

T. europaea have also been found to spend a lot of time at the sides of drainage lines and streams but do not inhabit flooded or dry soils. However, dry areas do become important when their normal habitats become flooded. Factors such as the type of soil, vegetation present, and altitude have no effect on the areas that moles choose to inhabit. The one factor that does greatly influence the mole population in a specific area is the abundance of earthworms.[8] In suitable urban greenspace, an area of 10 hectares is required for population persistence, and the number of mole territories increases with available habitat.[9]

Reproduction

The European mole has a relatively short

breeding season, in the spring. Mating occurs over a span of a few weeks in March and April, followed by a gestation period of four to five weeks. Most births occur at the end of April or at the beginning of May. The litter size ranges from two to seven. The lactation period lasts for four to five weeks but at the end of June, the young are usually required to leave the tunnels. The lifespan is from three to five years.[10]

Feeding habits

One common belief about European moles is that they typically consume their own weight in food every 24 hours, but this is an exaggeration. Studies have been performed that show European moles eat about half of their body weight in food each day. When in captivity, European moles will eat a wide variety of food items, including liver, mice, mealworms, shrews and maggots. However, they tend to prefer earthworms over all other options.[7] In areas without as many earthworms, insects are the main dietary constituent.[11] Moles eat both larval and adult insects.[11]

Vision

Due to the subterranean nature of this mole, there is an anatomical regression of its eyes at several organizational levels. Its eye has a

axons. Roughly 15% of these axons are myelinated. The photoreceptors are not the normal rod-like or cone
-like shape that one would expect to see. Instead they all have one uniform shape with three distinct features:

  1. The receptors are short along the radial axis
  2. The inner and outer segments are similar in length
  3. The outer segments appear to be significantly degenerated

Studies have shown that T. europaea does have

cone cells in the eye are unlikely to provide high-resolution vision but they could allow a detection of movement and some hue discrimination. It is suggested that in subterranean mammals vision is used to detect predators that have broken into the tunnels.[12]

Hearing

In mammals, the cues for hearing are usually based on inter-aural intensity differences, which occur as a result of the diffraction of a progressive

crickets have been shown to have a direct air pathway between the tympana.[13]

Skeletal development

In Talpa europaea, there are several unique changes in ossification sequence in the

thoracic
regions. The shifts allow the moles to have a more stabilized body axis and cervical region after they are born.

After a European mole is born and begins to develop, it will begin to crawl around and dig. As a result of the constant digging action, elements of the forelimb that are associated with those movements will begin to ossify. Some elements in the hands of Talpa europaea, formally described as distal

flexor digitorum profundus. The particles then fuse later in life to form the solid element of the hand. Additionally, the sesamoid bone in the European mole sensu stricto is a bone that develops within a tendon. It does have a chondrified precursor and it assists the tendon in transmitting force.[14]

Dentition

The variance of

paleontologists, as it can help define a fossil species. Unlike other characteristics that do not fossilize, like color and karyotype, dentition
can be studied, as it fossilizes well and varies from species to species. Studying dentition can be very beneficial in recognizing the differences between fossils and subsequently being able to classify them.

The Roman mole (

molars is generally divided. The dentition of T. europaea is small and the length of M1-M3 is less than 19% of the length of the condyle base. This mole also has relatively small molars for its size.[15]

  • Molehills
    Molehills
  • Portrait
    Portrait
  • Skeleton
    Skeleton
  • An albino
    An
    albino

See also

References

External links