5 Dairy Cow Isopods (Porcellio laevis), about 1/2" to almost 3/4". These are actually crustaceans. They are big (for an Isopod), and make unique pets, cleaners for your terrarium, paludarium, or even a great feeder colony for your reptiles (these guys are easy breeders). One of the most undemanding (and coolest looking) Isopods to keep.