They've been known to raid crops in some areas. They make use of quite a few plant species in whatever area they are found. Macaques are diurnal, and both arboreal and terrestrial. They normally form multimale-multifemale groups with strong hierarchies, often determined by the mother's rank. Females usually outnumber males.
Macaques have quite complex social and behavioral systems which are difficult to summarize.
Some tool-use and cultural innovations have been observed. Group size can vary from 10 up to around 100 individuals. Group fusion and fission occurs. These monkeys can be quite aggressive, both to each other and to other species. Rhesus macaques were observed mobbing a tiger, and stump-tailed macaques are feared by locals.