The slender lorises (Loris) are a genus of loris native to India and Sri Lanka. Lemurs, lorises, and galagos are not monkeys; instead they are strepsirrhine primates. Solitary-but-social species include mouse lemurs, lorises, and orangutans. Compared with the slender lorises, the snout of the slow loris is even less pointed. On rare occasions, orangutans will prey upon other, smaller primates, such as slow lorises. Soon after, the lorises and tarsiers made the same journey. Captive pygmy slow lorises also make characteristic gouge marks in wooden substrates, such as branches. About 175 pygmy lorises live in breeding facilities worldwide. The lorisids are all slim arboreal animals and comprise the lorises, pottos and angwantibos. Some strepsirrhines, such as the galagos, slender lorises, and angwantibos, are primarily insectivorous. Chemical signals play a role in the reproductive behavior of female pygmy slow lorises. Populations of Bengal and Sunda slow lorises are not faring well in zoos. Slow lorises (of the genus "Nycticebus") are accepted as the only known venomous primate. Both slender and slow lorises have relatively short feet. The two greatest threats to slow lorises are deforestation and the wildlife trade.