In August 2017, thousands of people traveled hundreds of kilometers to witness a full solar eclipse, a rare event in which Earth, moon, and sun align so the moon’s shadow fully blocks the sun. Several species—besides humans—are known to behave unusually during eclipses, and new research adds bees to the list, The Atlantic reports. Researchers set up 16 tiny microphones near pollinating hot spots in Oregon, Idaho, and Missouri in the path of totality. Bees there ceased flying and fell nearly silent for the duration of eclipse, they report this week in the Annals of the Entomological Society of America. The scientists suspect the bees went into “nighttime mode” in response to the sudden loss of sunlight.