Pill millipedes are short compared to other millipedes, with only eleven to thirteen body segments, and are capable of rolling into a ball when disturbed. 
When they are rolled-up, most pill millipedes reach a maximum size of a cherry or golf ball, but some species from Madagascar can even reach the size of an orange. 
When rolled-up, predators are unable to unravel pill millipedes since the margins of their second and last dorsal plates fit perfectly into one another, creating a sealed ball. 
​Pill millipedes feed on decomposing plant matter, usually in woodlands.

Nosy Komba, Madagascar, 21 February 2020