People across the county reported on Twitter of unusually large swarms across the county.
The insects are the mature queens and males of the common black ant who have left their nests to swarm and find mates.
They gather in the summer because conditions are perfect for flying and creating new nests, with warm air and long nights.
People in Sussex have reported driving through thousands of the insects and others of having to go indoors while the garden has been overwhelmed by them.
The Royal Society of Biology has been conducting a survey in recent years looking at whether the ants choose a specific time to fly.
This follows the theory that there was a ‘flying an day’ which has been disproved.
They are asking the public to get in touch if you see flying ants.
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