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Usually insects although other methods such as wind can do it.
There are too many stick insect species to identify. In fact, there are over 3,000 to be more accurate. Most of the species are around the tropics though (Wikipedia). * Lord Howe Island Stick Insect
6000000-3500 = 5996500 species are not Bees!
they would be in the flying insects species.
They are insects.
Many species of insects do.
Insects are not a species. Insects are are a class of invertebrates within the arthropod phylum. That is like asking if mammals are the most numerous species. Your question needs to be refined. Are you asking if insects are the most numerous class of animal? Most numerous species of living thing? Or perhaps you are thinking of a specific species such as monarch butterfly (Danausplexippus).
Insects.
About 900,000 species.
There are nearly one million known species of insects and as many as an estimated 10 million undescribed ones.
more than 800,000
Don't think anyone knows which exact species for sure. "Insects" is wrong, as insects are not a single species but is instead an entire class of arthropods, consisting of more than a million separate species.