The striking behaviour of several species ofGonodactylus, ofPseudosquilla ciliataand ofOdontodactylus scyllaruswas studied in unharmed animals and in animals with modified eyes and/or an‐tennal scales and antennae. Modifying sensory inputs increases aggressiveness i.e., striking frequency. Precision of hitting the centre of a target disk increases if the middle bands of the eyes are covered and in one‐eyed animals without antennal scales, and decreases if the sides of the eyes are covered. Habituation occurs if trial intervals are shorter than fifteen minutes. Localization and hitting a target in a critical zone should be automatic according to a previously developed model. According to the experiments reported here an additional, learned identification seems to be necessary for the decision to strike. The capacity for learning is shown by habituation. The possible mechanisms for instantaneous and simultaneous localization and identification of a prey (even by animals missing large parts of the eyes) in parallel, nervous subsystems is discussed.