Abstract. Ceratophysella sigillata uses protrusible vesicles on its antennae and posterior end as sticky landing devices to avoid tum bling upon landing. This technique facilitates its orientated movement during winter migration. It allows the animal to use direc tional jumps without rebounding even when climbing tree trunks. The antennal vesicles are present only in the surface active morphs of C. sigillata, and only these individuals jump readily. The vesicles are everted only when the animal has time to prepare the jump. In an escape leap, they are not protruded and therefore the animal tumbles upon landing.