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Why do Dragonflies sometimes appear in large swarms?
Several species of dragonfly are known to collect in large swarms. In most cases this appears to be due to very favorable feeding conditions in the area. It may also be a "courting" group with males actively searching for females. This is less likely as males are much more aggressive to each other when looking for a mate.
Some dragonflies gather in swarms before moving to a new area (like a bird migration). The reasons for this are unclear but may be due to population pressures. There are records from the US of migratory swarms.
Originally posted by FudgeStix
I'm in the UK and I've noticed hundrens this year, when we only ever see one if we're really lucky. It's quite surreal, but I think their beautiful ^_^
Originally posted by loam
While I haven't seen any swarms, I have definitely noticed more of them this year than I seen in recent memory.
I wonder why that is?
Like the better known migration of birds and of monarch butterflies, long-distance migration of certain species of dragonflies occurs annually throughout much of North America.
Sometimes it takes the form of spectacular mass flights that can involve hundreds of thousands, even millions of individuals.
Originally posted by Dark_Raven
I live in Alberta, Canada and i to have noticed that there are dragon flies everywhere here this year, more then ever seen before. I thought that was strange.
Because migration occurs over such a broad area, and because mass flights are largely unpredictable, no one person, or even any small group, can keep up with what's happening across the continent.
Originally posted by closettrekkie
All things go in cycles it seems. Remember the year when we had a ton of those Japanese ladybugs infesting everything?
Originally posted by Direwolf
It could also be a release program swarm. The big blue guys are raised for release as mosquito control. It seems that they are hungrier than the other smaller species.