They do that in order to get nectar which helps pollinate a flower
Flowers attract by smell and color, but some birds are attracted to pine cones, like the various species of finches called crossbills.
Small birds typically eat a diet consisting of seeds, grains, fruits, insects, and small invertebrates. They have specialized beaks that allow them to crack seeds and capture insects efficiently. Small birds also rely on nectar and pollen from flowers as a source of food.
Tailor birds primarily eat insects such as ants, beetles, caterpillars, and spiders. They also feed on small fruits and berries, and occasionally sip nectar from flowers.
Most plants need to have pollen transferred from one flower to another. They produce nectar to attract insects such as bees. As the insects take the nectar some of the pollen sticks to their bodies and is transferred to the next flower they visit. It could be seen as a a sort of payment by the plant for services by the insects.
an example of mutualism could be an oxpecker and a rhino. The birds peck and eat little insects on the rhino's back for food. The rhino then has harmful insects removed because of the birds. Also, rhinos have bad eyesight. When the birds see danger they fly away which warns the rhino (because it can feel the birds lifting off) that danger is near.
bees because the need pollen from flowers
flowers
By their scent, by the food some flowers offer (pollen and nectar) and by the colours of the flowers.
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Bees and other insects collect pollen from flowers and distribute them among other flowers so they can bloom and become somewhat "healthier".
to attract birds and insects
Insects birds berries flowers snails spiders scorpions
any flowers that are full of nectar that also attract small bugs and insects. EG the honeysuckle
Flowers attract by smell and color, but some birds are attracted to pine cones, like the various species of finches called crossbills.
humming birds will visit red flowers and yellow flowers with the same frequency
Some insects visit a plant to eat it. e.g. termites, carpenter ants.Some insects visit a plant to drink its juices or sap. e.g. male mosquitoes.Some insects visit the flowers of a plant to collect its sugary nectar. e.g. honey bees.etc.
The stigma of a flower contains sugar to attract pollinators such as bees, butterflies, and birds. The sweet taste of sugar helps in enticing these pollinators to visit the flowers and transfer pollen, aiding in the process of fertilization and reproduction for the plant.