The savannah monitor (Varanus exanthematicus) is a medium sized species of monitor lizard native to Africa. The species is known as Bosc's monitor in Europe, since French scientist Louis Bosc first described the species. It belongs to the subgenus Polydaedalus, along with the Nile, the ornate and other monitors.
The specific name exanthematicus is derived from the Greek word (ɛkˈsænθɪm) : exanthem meaning an eruption or blister of the skin. French botanist and zoologist Louis Augustin Guillaume Bosc originally described this lizard as Lacerta exanthematica in reference to the large oval scales on the back of its neck.
Bosc's or savannah monitors are stoutly built, with relatively short limbs and toes, and skulls and dentition adapted to feed on hard-shelled prey. Maximum size is usually between 105 to 155 cm (3.5 to 5.0 ft) in length, although most specimens collected in the wild ranged from 60 to 76 cm (2 to 2.5 ft) with females being considerably smaller. The pattern of coloration of the skin varies according to the local habitat substrate. The body scales are large, usually less than 100 scales around midbody, a partly laterally compressed tail with a double dorsal ridge and nostrils equidistant from the eyes and the tip of the snout.
Information about the diet of savannah monitors in the wild has been recorded in Senegal and Ghana. It feeds almost exclusively on arthropods and molluscs. In Senegal, Iulus millipedes were the most common prey of adults; in Ghana, small crickets formed the bulk of the diet of animals less than two months old; orthopterans (especially Brachytrupes), scorpions and amphibians were the most common prey of animals six to seven months old .
Its range extends throughout sub-Saharan Africa from Senegal east to Sudan and south almost to the Congo River and Rift Valley, where they are replaced by V. albigularis. V. exanthematicus is primarily a ground-dwelling species that shelters in burrows, although it is sometimes found in bushes or low trees. In the coastal plain of Ghana, V. exanthematicus juveniles are often associated with the burrows of the giant cricket Brachytrupes.
Varanus exanthematicus is listed as Least Concern by IUCN. The species is hunted for its leather and meat and for the international pet trade. An average of 30,574 live specimens were imported into the US each year between 2000 and 2009; total imports of live specimens into the US between 2000 and 2010 was 325,480 animals. During the same period, 1,037 skins, shoes, and products of the species were imported into the US. Trade in live animals comes mainly from Ghana (235,903 animals exported between 2000 and 2010), Togo (188,110 animals exported between 2000 and 2010), and Benin (72,964 animals exported between 2000 and 2010). During the same period, total worldwide declared exports of skins and products of the species totalled 37,506. However there is substantial undeclared trade in the species from Sudan, Nigeria and elsewhere
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