Tenrecs are small mammals of variable body form. The smallest species are the size of shrews, with a body length of around 4.5 cm (1.8 in), and weighing just 5 g (0.18 oz), while the largest, the common or
tailless tenrec, is 25 to 39 cm (9.8 to 15.4 in) in length, and can weigh over 1 kilogram (2.2 lb).
 Although they may resemble shrews, hedgehogs, or otters, they are not closely related to any of these groups, their closest relatives being other African insectivorous mammals, such as
golden moles and
elephant shrews. The common ancestry of these animals, along with
sea cows in the group
Afrotheria, was not recognized until the late 1990s.
 Continuing work on the molecular
 and morphological
 diversity of afrotherian mammals has provided ever increasing support for their common ancestry.
placental mammals, the
urogenital tracts of tenrecs share a common opening, or
cloaca, a feature more commonly seen in
amphibians. They have a low
body temperature, sufficiently so that they do not require a
scrotum to cool their
sperm as do most other mammals.
All species appear to be at least somewhat
invertebrates forming the largest part of their diets. The three species found on the African mainland (Potamogale velox, Micropotamogale lamottei, M. ruwenzorii) have more specialized diets, centered on their habitat in fast-running streams of the African tropics, from Liberia in the west to Lake Victoria in the east. One species from Madagascar, Limnogale mergulus, is also semiaquatic.
 All of the species from Madagascar, semiaquatic or not, appear to have evolved from a single, common ancestor, with the mainland tenrecs comprising the next, most-closely related mammalian species.
 While the fossil record of tenrecs is scarce, at least some specimens from the early
Miocene of Kenya show close affinities to living species from Madagascar,
 such as Geogale aurita.
Most species are
nocturnal and have poor eyesight. Their other senses are well developed, however, and they have especially sensitive
whiskers. As with many of their other features, the
dental formula of tenrecs varies greatly between species; they can have from 32 to 42 teeth in total. Unusual for mammals, the permanent dentition in tenrecs tends not to completely erupt until well after adult body size has been reached.
 This is one of several anatomical features shared by elephants, hyraxes,
golden moles (but apparently not
aardvarks), consistent with their descent from a common ancestor.
Tenrecs have a
gestation period of 50 to 64 days, and give birth to a number of relatively undeveloped young. While the
otter shrews have just two young per litter, the tailless tenrec can have as many as 32, and females possess up to 29
teats, more than any other mammal.
 At least some tenrec species are social, living in multigenerational family groups with over a dozen individuals.