Bees such as this Eastern Carpenter Bee
are mutualistic pollinators, though sometimes a plant may trap the pollinator.
The Common Milkweed (Asclepias syriaca) has pollen tucked away in packets called pollinia.
A honeybee obtaining nectar inserts its legs in the slits surrounding the pollinia, usually carrying off the packets, but sometimes getting stuck.
Butterflies such as Monarch (Danaus plexippus) can be mutualistic pollinators as adults, though the juvenile caterpillars are predators as leaf eaters.
