Free images results:
 

Swarm pictures, stock photos and images

 
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Swarm Royalty Free Stock Photography
Author: Ichtor
Lunch Stock Photography
Author: Danijelm
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Bees swarm Stock Images
Author: Darkop
Bee swarm Royalty Free Stock Photos
Author: Alexeys
Swarm Royalty Free Stock Photos
Author: Taraki
Swarm Royalty Free Stock Photos
Author: Bierchen