These massive fleets of unknown objects have been appearing worldwide since first being seen in Mexico in the early 1990s. They seem to function in tandem, like schools of fish. Are they some sort of natural phenomenon? An undiscovered aerial life form? They are very strange.

http://www.youtube.com/watch?v=Eb5u2MJ_T-k
Story Source:
http://www.youtube.com/watch?v=Eb5u2MJ_T-k
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