The interbirth interval lasts approximately 7 months, and the female reproductive potential is 4 infants per year. The female estrous cycle lasts for 24 hours, and gestation periods are approximately 165 days. Males mate with multiple females throughout the year. Females mate with multiple males within a single estrous cycle and can mate with multiple males in a row. Grey slender lorises have a polygynandrous mating system. Average length Females: 23.4 Males: 24.1 cm in.Lastly, Loris lydekkerianus females have two sets of nipples, a feature that proves useful when females give birth to twins. However, in the closely related slender loris ( Loris tardigradus), enlargement of male genitals appears to be affected primarily by ambient temperature, with testes enlargement occurring during periods of increased temperature. In Loris lydekkerianus, no pattern has been observed with respect to male testes state and sexual activity. External genitalia is also present in adults, with estrous females displaying enlarged genitalia, and male testes alternating between descended and inguinal stages every other night. Juveniles (2 to 3 months) have particularly fluffy pelage all over the body, and adults (4 months onward) exhibit full body size and complete adult coloration patterns. Infants (4 to 8 weeks) have fluffy, large heads relative to body size. Grey slender loris appearance changes significantly throughout its development. The species also exhibits retia mirabilia of the proximal limb vessels, an adaptation that allows for extended periods of arboreal clinging. Loris lydekkerianus has many distinctive derived characteristics including extremely slender limbs, the closest orbital approximation of all primates, small hands in comparison with the feet, feet with shortened second digits, a unique non-saltatory locomotor style, digestive specializations for ingesting toxic prey, and an unusually low basal metabolic rate. Both male and female adults weigh approximately 180 grams. malabaricus has a reddish body color, a broad circumocular patch, and a narrow white rim between the dark preauricular hair and circumocular patch. The head length, body length, and head breadth are larger in L. The subspecies is generally larger in mass, with males weighing approximately 260 grams and females weighing 275 grams. lydekkerianus has gray body color, a narrow circumocular patch, and a broad white rim between the dark preauricular hair and circumocular patch. These different subspecies differ in geographic location, pelage, and size. There are four subspecies: Loris lydekkerianus lydekkerianus, L. The average male length is 24.1 cm and the average female length is 23.4 cm. Female weight ranges from 180 to 275 grams. Male weight ranges from 180 to 290 grams, depending on the subspecies. Grey slender lorises have no tails and the limbs are long and extremely slim. The coloring of the face is also distinctive they have circumocular patches, darker preauricular hair, and a white rim between the circumocular patch and preauricular hair. Their distinctly forward facing eyes are large and set closely together, while the rostrum is small and pointed. Grey slender lorises have grey or reddish dorsal pelage with a darker medial stripe and a white ventrum. ( Kumara, et al., 2005 Nekaris and Jayewardene, 2004 Nekaris, 2003a Radhakrishna and Singh, 2002 Schulze and Meier, 1995 Singh, et al., 2000) Grey slender lorises are sometimes inadvertently transported with plant materials. The range of Loris lydekkerianus has been expanded to an unknown extent due to the careless collection and distribution of plant materials. Grey slender lorises are found in many ecological zones including wet zones, low dry zones, and low country zones. Within these habitats, the ideal environment for this largely arboreal species contains plentiful oblique and horizontal surfaces for climbing, feeding, and mating. Grey slender lorises survive in a wide variety of habitats including dry forest, wet forest, montane forest, rainforest, and scrub forest. ( Nekaris and Jayewardene, 2004 Radhakrishna and Singh, 2002 Schulze and Meier, 1995 Singh, et al., 2000) Grey slender lorises are found in southern India and in central, north-central, and east-central Sri Lanka.
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