Fossils found of their ancestors date back to 450 million years ago and then they were 2m (6’) in length.
They have poor eyesight and depend on pheromone scents to find a mating partner.
Females hollow out a chamber in which she lays up to 300 eggs at a time and they take 2-4 weeks to hatch.
The larger species of millipedes encase each egg with a clay capsule but smaller species do it around the whole batch.
Millipedes do moult and this process can take up to three weeks to complete as they have to extract each leg from the old sheath.
Their lifespan can be as long as 10 years and the Giant Millipede who has dormant periods, even longer.