Most phyllostomids
are tiny echolocating bats that can navigate
cluttered rainforest understoreys and hover to take
small fruits or to sip nectar from relatively delicate
flowers. Most pteropodids, by contrast, are larger strongflying
bats that locate food by vision and smell, and
typically perch while feeding on larger fruits and morerobust
flowers. Fruit-eating Old World monkeys (Africa
and Asia) are relatively large primates with trichromatic
color vision [10] and well-developed cheek pouches that
enable them to spit, rather than swallow, seeds [11].