When we are walking and hiking we see many of these black slugs (bottom left) ranging in size from 1" to 6 or 7" long. They are the European Black Slug and are an invasive species in British Columbia. The native species is seen on the right and middle and it is mottled black and brown looking like an over-ripe banana. It is a local species but seems to be less prolific where we are. As you can see from the comparison to Zachary's foot they can grow very large. They produce a slime when they are wet so raccoons which like to eat them will roll them in dirt first to make them produce less slime.