Animal pollination.
This honeybee is harvesting pollen and nectar (a sugary solution
secreted by flower glands) from a Scottish broom flower. The flower
has a tripping mechanism that arches the stamens over the bee and
dusts it with pollen, some of which will rub off onto the stigma of
the next flower the bee visits. Video: 
The long, thin beak and tongue
of this rufous hummingbird enable the animal to probe flowers that
secrete nectar deep within floral tubes. Before the hummer leaves,
anthers will dust its beak and head feathers with pollen. Many flowers
that are pollinated by birds are red or pink, colors to which bird
eyes are especially sensitive. Some angiosperms, such as this cactus,
depend mainly on nocturnal pollinators, including bats. Adaptations of
such plants include large, light-colored, highly fragrant flowers that
nighttime pollinators can locate.