- Related Topics:
- shrew
- Oliver’s shrew
- Sulawesi tiny shrew
white-toothed shrew
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What is a white-toothed shrew?
The white-toothed shrew is any of 164 species of mouse-sized African and Eurasian insectivores that comprise nearly half of all true shrew species. As a genus, Crocidura contains more species than any other mammal genus. They are characterized by their white teeth, long cylindrical bodies, short legs, and long, mobile snouts.
These shrews inhabit temperate and tropical forests, grasslands, savannas, marshes, and semiarid habitats. Primarily terrestrial, they are active day and night, feeding on insects, arthropods, and earthworms. The greatest diversity of white-toothed shrew species is found in Africa.
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How can you tell white-toothed shrews apart from other shrews?
White-toothed shrews, belonging to the genus Crocidura, are distinguished from other shrews by their white teeth. With over 164 species, they constitute nearly half of all true shrew species (family Soricidae). These mouse-sized insectivores possess a long, mobile snout, a cylindrical body, and short legs. Their fur color ranges from gray to dark brown and blackish.
Other characteristics of shrews include a foul odor caused by scent glands on their flanks and other body parts. Shrews have small eyes, rounded and moderately large ears, and 26 to 32 teeth that are not replaced during their life.
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Where do white-toothed shrews live?
White-toothed shrews of the genus Crocidura consist of 164 species that inhabit temperate and tropical forests, riverine forests, marshes, temperate steppes and other grasslands, savannas, and semiarid habitats of Africa and Eurasia.
Africa contains the greatest diversity of white-toothed shrew species, with 106 species distributed throughout the continent except for some Saharan regions. Fifty-three species range from Asia Minor eastward to Southeast Asia, excluding tundra, taiga, and harsh deserts. White-toothed shrews also populate the islands of Taiwan, the Philippines, and Sulawesi. C. monticola lives on the Malay Peninsula, as well as on the islands of Borneo, Java, and Bali eastward through the Lesser Sunda Islands to Aru Island on the Australian continental shelf. C. suaveolens is broadly distributed across much of Eurasia and onto some Atlantic, Mediterranean, and Pacific islands. The range of C. leucodon includes Europe and Asia Minor; C. russula occurs in Europe, in northwestern Africa, and on Atlantic and Mediterranean islands.
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What do white-toothed shrews eat?
White-toothed shrews (Crocidura) are active day and night, and their diet mainly consists of insects, other arthropods, and earthworms. They catch prey with their mouths and manipulate it with their flexible proboscis rather than their paws.
These shrews inhabit temperate and tropical forests, riverine forests, marshes, temperate steppes and other grasslands, savannas, and semiarid habitats. While primarily terrestrial, some tropical species can climb and forage both on and above the ground.
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How do white-toothed shrews behave and how do they survive?
The white-toothed shrew (genus Crocidura) is a mouse-sized insectivore found in Africa and Eurasia. With 164 species, it comprises nearly half of all true shrew species.
These shrews have a cylindrical body, short legs, a long mobile snout, and white teeth. Their fur is short and velvety, ranging from gray to dark brown. Active during both day and night, white-toothed shrews primarily live on the ground, but some tropical species can climb bushes and trees.
To survive, they nest in rock crevices or burrows (often made by other animals) and eat insects, arthropods, and earthworms, which they catch with their mouths. Some species of white-toothed shrews share habitats with shrew rats. The shrews consume insects, while the shrew rats eat mostly earthworms.
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Why are white-toothed shrews important in their ecosystems?
White-toothed shrews (genus Crocidura) play a crucial role in their ecosystems as insectivores that consume insects, other arthropods, and earthworms. They are active day and night, foraging on the ground, and some species are agile climbers, searching for food in bushes, vines, and small trees. In areas like New Guinea, where true shrews are absent, shrew rats take on the ecological role of white-toothed shrews by primarily feeding on insects and other invertebrates. Additionally, white-toothed shrews serve as a food source for other animals, contributing to the food chain within their habitats.
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white-toothed shrew, (genus Crocidura), any of 164 species of mouse-sized African and Eurasian insectivores making up nearly half of the more than 325 species of true shrews (family Soricidae). No other genus of mammals contains as many species. Seven were named during the last decade of the 20th century, and undoubtedly new species await discovery. These shrews have white teeth, a long cylindrical body, short legs, and a long, mobile snout. Their eyes are small, but their ears are large. The finely furred tail ranges from shorter to longer than the body and in some species has long bristly hairs (vibrissae) scattered over its surface.
Among the largest is Olivier’s shrew (C. olivieri) of sub-Saharan Africa, which weighs 37 to 78 grams (1.3 to 2.8 ounces) and has a body 11 to 15 cm (4.3 to 5.9 inches) long and a tail of 8 to 10 cm. One of the smallest is the Sulawesi tiny shrew (C. levicula), which weighs about 4 grams and has a body 6 cm long and a 3- to 4-cm tail. The colour of the short, soft, and velvety fur ranges from gray to dark brown and blackish.
White-toothed shrews inhabit temperate and tropical forests, riverine forests, marshes, temperate steppes and other grasslands, savannas, and semiarid habitats. Active day and night, they are primarily terrestrial, but some tropical species are agile climbers and forage both on and above the ground. They nest in burrows (usually those of other animals), rock crevices, and sometimes tunnels in moss growing on montane forest trees. Their diet mainly consists of insects, other arthropods, and earthworms. Prey is caught with the mouth and manipulated by the flexible proboscis rather than the paws. Litters contain 1 to 10 young, and gestation lasts a month.
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Africa contains the greatest diversity of species (106), and they are distributed throughout the continent except for some Saharan regions. Shrews were important in the religion of ancient Egyptians, and six African species have been found embalmed and mummified in animal tombs along the Nile. Fifty-three species range from Asia Minor eastward to Southeast Asia, excluding tundra, taiga, and harsh deserts. White-toothed shrews also populate the islands of Taiwan, the Philippines, and Sulawesi. C. monticola lives on the Malay Peninsula, as well as on the islands of Borneo, Java, and Bali eastward through the Lesser Sunda Islands to Aru Island on the Australian continental shelf. C. suaveolens is broadly distributed across much of Eurasia and onto some Atlantic, Mediterranean, and Pacific islands. The range of C. leucodon includes Europe and Asia Minor; C. russula occurs in Europe, in northwestern Africa, and on Atlantic and Mediterranean islands. Two species are found only on islands in the Mediterranean Sea.
Crocidura is classified in the subfamily Crocidurinae of the family Soricidae (order Soricomorpha), which belongs to a larger group of mammals referred to as insectivores. The closest living relatives of white-toothed shrews are members of nine genera within the same subfamily. The evolutionary history of Crocidura extends to the middle Miocene Epoch (16 to 11.6 million years ago) in Asia Minor and probably Africa, the early Pliocene Epoch (5.3 to 3.6 million years ago) in Europe, and the Pleistocene Epoch (2.6 million to 11,700 years ago) in eastern Asia and the Mediterranean region. Since the most primitive species inhabit tropical forests in Africa, the genus probably originated on that continent.