Creatures? Creature Soil is a safe, proprietary blend of natural materials, including Peta Moss, Soil, Sand, and Carbon. Great for a variety of creepy-crawlers, as well as natural plant life in habitats. Proprietary blend of natural materials including Peta Moss, Soil, Sand & Carbon. Ideal for spiders (including tarantulas), insects and other invertebrates. Increases humidity and promotes natural burrowing behaviors. Great for live plants