5thgr Guess which vertebrate/invertebrate is hanging from their backs! @CampbellAPS @APSscience #learningwhilemoving

5thgr-guess-which-vertebrateinvertebrate-is-hanging-from-their-backs-campbellaps-apsscience-learningwhilemoving-httpst-cooswk9kheow 

5thgr Guess which vertebrate/invertebrate is hanging from their backs! @CampbellAPS @APSscience #learningwhilemoving https://t.co/OsWk9kHeoW