"They mostly come at night. Mostly." -- Biters in polluted areas become more aggressive at night. Includes an option to have biters only attack at night.
Please add a header line (only dashes: "---------------") at the start of your changelog, so it can be correctly parsed by the game! You'll find more detailed information about changelog syntax at https://forums.factorio.com/viewtopic.php?f=25&t=67140. :-)
