What do barnacles feed off of? Do you see the barnacles attached to this humpback? 🦀 🐋 Although barnacles attach to humpback whales, they feed on microorganisms stirred up as the humpbacks move about the ocean rather than directly feeding off the whales themselves. When they leave their feeding grounds, a single humpback may have up to a ton of barnacles attached to its body! This offers a wonderful up-close look to some of those pests! 📸 Research activities authorized under NMFS/MMPA ESA Per