sentence: Some species can roll up into a ball when in danger.
sentences_before: They are often confused with centipedes, millipedes or insects, but are actually crustaceans. They have fourteen legs and breathe through gills. Because of the gills, woodlice need water in the air around them.
sentences_after: In such position, their hard shell faces out, protecting the softer parts of the body.
concept_name: specie
headings: Sow bug
categories: isopods