Clean and condition your terrarium & vivarium soil naturally. Shipped in damp sphagnum to ensure live arrival. A hobbyist favorite! Very active & prolific species. Our Porcellio laevis "Dariy Cow" Isopods are sold in various count cups of established juveniles. Originating from Europe, these active isopods bring your terrarium to life. The name "dairy cow" comes from their black and white coloration, which resembles the pattern of a Holstein dairy cow. They're a very lively and prolific species that in our experience flourishes in a warm and semi-humid environment. They can be seen exploring their environment throughout the day and night. As with all of our insects, live arrival is guaranteed.