What adaptations do animals have for pollination and obtaining nectar?

A very large number of insects have the ability to pollinate plants. Many do it involuntarily, simply because they sit on flower plants. But bees, wasps, bumblebees pollinate plants constantly, in the hoi of obtaining nectar. If you look closely at them, you can see that there are hairs on their body. You can also see pollen that sticks to insects and is thus transferred to other plants. For obtaining nectar, they have a special constitution, organs and proboscis. With the help of them, nectar is extracted.