Isopod Colony - Dairy Cow 10+ ctIsopods are a must for all terrariums! They are vital to the health of terrariums because they eat the decomposing materials like dead leaves, rotting wood, and other undesirable material. They will also till the soil adding aeration while also helping to fertilize the soil! The Dairy Cows (Porcellio laevis) are a medium large species with fast breeding and big appetites! They are best in terrariums with something that can eat them, like frogs,