Do insectivorous animals perceive green, caterpillar-shaped clay as a tasty meal? Ecologists sometimes use plasticine models mimicking natural prey, such as caterpillars, fruit, bird eggs, snakes, and ...

WE were keeping some snails (Helix pomatia} without food, under a bell-jar with a wide tubulure at the top ; in the tubulure was a cork bearing a thermometer. We found that the snails ate the cork, so ...