Rumina decollata (decollate snail)

Originated in the Mediterranean but has been introduced in a number of areas worldwide.

The shell of the decollate snail is long and roughly cone-shaped. It grows to approximately 40–45 mm (1.6–1.8 in) in length and a width of 14 mm (0.55 in), and upon reaching mature size, grinds or chips off the end of its own shell by moving its body roughly against hard surfaces, so that the shell takes on a decollate shape, tapering to a blunt end.