Slow Lorises are small, nocturnal and shy primates. So, it is very difficult to identify their sex and estimate the age. Is there any way to identify the sex and estimate the age without capture the individual? Is there any sexual dimorphism in this species?
Actually there is no sexual dimorphism. Males and females look alike and can only be differentiated by looking at the gonads. Male Bengal slow loris testicles have an average weight of 1.2 grams, with a vas deferens length of 85.5 mm. The dental formula: I 2/2 C 1/1 P 3/3 M 3/3 = 36 (Fitch-Snyder and Schulze, 2001; Groves, 1998; Nekaris, et al., 2013; Smith and Jungers, 1997).
Young lorises are noticeably fluffier. Even googling some pictures should give you an idea of the differences between adults and juveniles. Beyond that, I don't know of any non-invasive way to determine age. And as mentioned above, the only way to sex them is by examining the genitals.
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