Slime molds look gross and... not smart, but they definitely seem to communicate and plan even without neurons. Michael explains the science behind these clever eukaryotes.
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Sources:
http://www.ucmp.berkeley.edu/protista/slimemolds.html
https://www.theatlantic.com/science/archive/2016/12/the-brainless-slime-that-can-learn-by-fusing/511295/
http://www.pbs.org/newshour/rundown/the-sublime-slime-mold/
http://www.nature.com/news/how-brainless-slime-molds-redefine-intelligence-1.11811
https://www.researchgate.net/publication/312167286_Direct_transfer_of_learned_behaviour_via_cell_fusion_in_non-neural_organisms
http://science.sciencemag.org/content/327/5964/439.full
https://pdfs.semanticscholar.org/8f6d/55e8a46fdcf117764da0d5a2a67e82c6807f.pdf
http://rspb.royalsocietypublishing.org/content/283/1829/20160446
http://rspb.royalsocietypublishing.org/content/283/1845/20162382