The word hum is related to the Middle High German hummen and thus to the modern German Hummel – meaning bumble bee. Fun fact: While bees need at least 10 °C to be out and about bumble bee workers fly already at 6 °C because the vibration of their pectoral muscles vibrate to generate heat. Which in turn makes the fairly loud humming noise of bumble bees.

Ragtag Daily Prompt: Hum