Pollination happens when bees visit flowers to gather nectar and pollen. As they visit each flower, the pollen catches on their bodies and passes to the next flower, so fertilizing them. Bees don’t just feed themselves, but collect food for the whole colony.
Other animals, such as beetles, butterflies and bats, are also pollinators, but because they only gather enough food to eat themselves, they don’t visit as many flowers as bees.
That’s why bees are the most important pollinators.