Pine Tree Ants in ceiling, making noise

This video taken by Ryder Richards in 2015, in Arnold California, shows pine tree ants, Liometopum luctuosum, in the ceiling of a house. You can hear the noise they make. It appears the ants excavated their way through the Celotex insulation, and the rift is in the egg storage area of the nest, as they are dropping eggs and larvae through the crack.

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