Why Do Planarians Have Those Triangles on their Heads?

Flatworms are kind of adorable. And they have keep scientists up at night for a few reasons.

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SOURCES:
https://ucmp.berkeley.edu/platyhelmin...
https://www.frontiersin.org/articles/...
https://www.pnas.org/doi/full/10.1073...
https://doi.org/10.1186/s40851-014-00...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://archives.collections.ed.ac.uk...
https://archive.org/details/b21946668...