Assertion: proboscis monkey's group | /r/MadeOf | bennett
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Source sentences:
text: The social structure of the proboscis monkey is flexible but the most typical group is the one-male group consisting of an adult male, females and their offspring (Bennett & Sebastian 1988; Rajanthan & Bennett 1990; Yeager 1990b; 1992; Bennett & Gombek 1993; Boonratana 1993; Yeager 1995; Boonratana 2002; Murai 2004).