Sciurinae Subfamily
Different types
Squirrels are a diverse group with about 279 species and 51 species divided into five families (Ratufinae, Sciurillinae, Sciurinae, Xerinae, and Callosciurinae). The Sciuridae family includes tree squirrels, ground squirrels, and flying squirrels. Tree spiders have long, bushy tails, sharp hands, and large ears. Some have well-developed ear tufts. Flying squirrels have skin (patagium) that extends between the wrists and ankles that allows them to fly between trees. Ground squirrels are usually more robust than tree squirrels and often have short, stiff legs that are used for playing. Their tails, although well-furred, are not as bushy as those of tree squirrels. ("IUCN Red List of Threatened Species", 2008; Gurnell, 1987; Jansa and Myers, 2000; Lurz, 2011; Steppan and Hamm, 2006; Thorington and Ferrell, 2006)
Sciurids range in size, from the modest African pygmy squirrels to the robust Asian red squirrels, weighing up to three kilograms. Their land distribution and habitat varies. Squirrels are native to all parts of the world except Antarctica, Australia, South America and some desert areas. They also inhabit habitats ranging from tundra to forest. Some squirrels live solitary lives like groundhogs, while others, like prairie dogs, live in communities of hundreds of individuals with complex social structures. Bones are usually herbivores, eating fruits, vegetables, fruits, fungi, and other plants; However, insects, eggs, and small vertebrates can sometimes be part of the diet of these animals. ("IUCN Red List of Threatened Species", 2008; Gurnell, 1987; Jansa and Myers, 2000; Lurz, 2011; Steppan and Hamm, 2006; Thorington and Ferrell, 2006)
Local area
Squirrels are found all over the world, originating from all regions except Australia, Madagascar, southern South America, Antarctica, Greenland, many oceanic islands, and some desert areas such as the Sahara. Two species of squirrels were introduced to Australia in the 19th century, Sciurus carolinensis and Funambulus pennantii, but only F. pennantii remained there. Squirrels are especially diverse in the forests of Africa and Southeast Asia. (Anderson and Jones, 1984; Macdonald, 1984; Matthews, 1971; Nowak, 1991; Seebeck, 1989; Steppan and Hamm, 2006; Thorington and Ferrell, 2006)
Biogeographical region Near Palearctic native Oriental native Ethiopian native Neotropical native Australian introduced.
Other Holarctic Regional Terms
Place of residence
From trees to landscapes, sciurids are found in a wide range of habitats, including rainforests, dry grasslands, arctic tundras, forests, rural areas, and cities. Sciurids can be found at high altitudes, such as Himalayan marmots (Marmota himalaya), which are at altitudes up to 5000 meters. (Steppan and Hamm, 2006; Thorington and Ferrell, 2006)
Tropical habitats
Terrestrial Biomestundra taiga desert or dune savannah or chaparral grassland rainforest clearing forest.
Other characteristics of rural housing
Systematics and taxonomic history
The first division of modern squirrels in 1923 recognized six families: Sciurinae, Tamiasciurinae, Funambulinae, Calosciurinae, Xerinae and Marmotinae. In 1959, Moore recognized six families as tribes (as suggested by Simpson in 1945) but added two more tribes to the genera previously included in the Funambulini: Ratufini and Protoxerini. Over the years, many other reorganizations of other tribes and families took place until Sciuridae has only two families, Sciurinae (tree and ground squirrels) and Pteromyini (flying squirrels), and ten tribes (Callosciurini, Funambulini ) More recently, genetic evidence (analysis of mitochondrial 12S rRNA and 16 rRNA genes and analysis of c-myc, IRBP and RAG1 nuclear genes) and analysis of cranial morphology support a higher classification, Sciuridae is divided into five families: Sciurillinae (South). American pygmy squirrels), Ratufinae (giant tree squirrels), Sciurinae (Holarctic tree and flying squirrels), Callosciurinae (South Asian tree squirrels), and Xerinae (African tree and flying squirrels). The main difference between this classification and the classification of the two older families is that tree squirrels (formerly Sciurinae) are recognized as more closely related to flying squirrels (formerly Pteromyini) than to ground squirrels. (Xerinae, formerly Sciurinae) and, worldwide, trees. squirrels are polyphyletic. (Wilson and Reeder, 2005; Dewey, 2007; Michaux, et al., 2008; Steppan and Hamm, 2006; Steppan, et al., 2004; Thorington and Ferrell, 2006; Wilson and Reeder, 2005)
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