Springtails are the clean up crew of mold and fecal matter of your bioactive or non bioactive tank for your reptiles and or amphibians, and can also be used as small feeders for your smaller critters. If these guys end up dead upon shipping, we need pics within 1 hour of arrival, when shipment is shipped out, you will need to keep an eye on your tracking number in order for it to become 100% live arrival guarantee, these guys sitting in a hot box or even cold box will kill these guys, so please keep an eye on your shipment! Other than that this is a great colony and will do your terrarium justice!