Heat defence strategy of Japanese honeybees against a hornet 

They team up to form a heat ball, bees vibrating  their wing muscles to generate temperatures of about 46° for more than 30 minutes,  
 https://t.co/dfC2vZyT3z https://video.twimg.com/ext_tw_video/1849433655631855617/pu/vid/avc1/720x1280/Awuyw-6yNkQJhC5X.mp4?tag=12