One celled organisms acting as a swarm?




I read about the slime mold, which is actually not a mold but a "city"
of one-celled slime mold cells, each can separate and act
independently.

Can someone give me some other examples of this? Of one-celled
lifeforms that act together as a swarm to do interesting/intelligent
things? Some particular types of bacteria maybe? Any and many
examples appreciated, thanks.




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