Butterflies' 'secret' to keeping cool hidden in wings Research News Amazon.com: Premom Fertility Lubricant, pH Balanced, Sperm Friendly, Water Based Personal Lube for Women, Men, & Couples Trying to Conceive, No Glycerin or Parabens, Fragrance Free, Condom Safe, 4 Fl Oz : A Surreal Butterfly with Transparent Liquid Glass Wings, Flying through a Mystical Landscape of Glowing Plants and Floating Stock Illustration Illustration of glowing, futuristic: 355443496 Ever notice a monarch butterfly vibrating its wings? This isn't just random behaviorit's a survival strategy called Shivering. Especially when temperatures drop, m the_monarch_movement Facebook