Facts about Sow Bugs: Although the word ‘bug’ is in their name, sow bugs (also referred to as woodlouse), are not really bugs at all and are in fact land-living crustaceans! They belong to arthropod group, which are invertebrate animals who have exoskeletons and jointed appendages. Sow bugs are tiny creatures who are about 1cm in length, have 7 pairs of legs, and have 2 pairs of antennae. Another bug that resembles the sow bug and is often mistaken for one is the pill bug. The pill bug has the ability to roll up into a ball when it is disturbed (unlike the sow bug) and the sow bug has appendages ...