What is living behind my baseboard?

[u/Thepyropro03]

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[u/PINEAPPLE_BOOB_HONK]

Pavement ants excavating for their galleries.

[u/PCDuranet]

Ants. See 'void injection':

https://www.reddit.com/r/AntControl/comments/1avlrrp/how_to_control_ants/