What are listed as reasons for the establishment of non-native populations outside of Asia?
Answer
The historical pet trade and biomedical research
Introduced colonies outside the native range are attributed to various human activities, including historical trade in pets and the use of these primates in scientific studies.

Related Questions
Which broad geographic region encompasses the native distribution of the crab-eating macaque?Which of these nations is explicitly listed as part of the crab-eating macaque's continental range?What specific type of environment do these macaques show a strong affinity for, distinguishing them from some other macaque species?Which area of archipelagos is highlighted as being particularly numerous in long-tailed macaques?According to the IUCN Red List assessment mentioned, what is the conservation status of the crab-eating macaque?What are the primary factors cited for the significant population declines leading to the species' vulnerable classification?Which low-lying, water-proximal habitat is specifically mentioned as being inhabited by these macaques?Which large islands are cited as significant centers of diversity for the species in Maritime Southeast Asia?What are listed as reasons for the establishment of non-native populations outside of Asia?What evidence suggests potential evolutionary differences among island populations?