The whole guano extraction process it’s been renovated, in order to protect workers and the bats and the environment.
The caves are in remote areas, almost always in mountainous zones that are difficult to reach, most containing several chambers where the bats live all day and much of the night. When the workers enter the caves, the bats move to another point or to other chambers if they exist, returning to their usual place when the workers leave. They are totally inoffensive to man.
At present, extraction in Los Angeles is done manually. The workers collect the guano and put it in sacks, then take it from the cave to more suitable locations for sifting, packing in double-skinned sacks, weighing and sealing.