Usually, there is no free pollen dust in an orchid blossom, with a few exceptions like Cypripedium. Instead, the pollen of orchids is usually "bundled" in two or more small packets, the pollinia. Often these packets are glued together with a sticky substance which tends to attach itself to the heads or backs of visiting insects. Many orchids offer free nectar or a nectar-like juice which can be squeezed out of the rear parts of the blossoms with the proboscis. Sometimes the insects pick up many pollinia at the same time during these activities and look "horned" when they carry them to the next blossom.
The nectar of some species, like Epipactis, is rumoured to contain narcotic substances. Sometimes the insects are behaving strange after visiting these blossoms. Perhaps they are just drunk and thus unable to remove the pollinia which tend to stick to several parts of their body?
