Small, benthic, cryptic fishes represent a species‐rich guild on marine substrates. Most of them are micropredators that feed on crustaceans that are often smaller than 1 mm. Typical examples are seahorses and pipefishes (Syngnathidae), most gobies (Gobiidae), dragonets (Callionymidae) and triplefins (Tripterygiidae). Previous work on the yellow black‐headed triplefin Tripterygion delaisi demonstrated that it actively redirect...