Honey Bees (Apis mellifera) visit flower spikes but are not effective pollinators.

The white-tailed dunnart ( Sminthopsis granulipes) has been recorded visiting flowerheads, though whether it is an effective pollinator is unknown.

For these reasons bumble bees are considered to be more effective pollinators than honey bees.

It is an effective pollinator for alfalfa.

Consequently, there is often strong selection pressure for highly specific communication channels that can advertise the presence of their flowers to effective pollinators but not to other individuals.

Of these, evidence suggests that only birds are effective pollinators.

Many plants are also diurnal or nocturnal, depending on the time period when the most effective pollinators, i.e., insects, visit the plant.

Bees of the subgenus Filiglossa in the same genus also feed only on Persoonia flowers but do not appear to be effective pollinators.

These carry pollen loads comparable to those of nectariferous birds, making them effective pollinators.

Fungus gnats (Mycetophilidae) may prove to be the effective pollinators.