The caterpillars are ordered with the enclosed voucher. Get to know the amazing transformation on the native thistle butterfly. Pull up 5 butterflies and learn everything about the transformation from caterpillar to butterfly. Watch as the caterpillars grow, pupate and then hatch as butterflies. When the butterflies are fully grown, you can release them into nature and watch them fly around in the garden. The development from caterpillar to butterfly takes about 3-5 weeks. (Recommended from 4 years). The set includes: voucher about 5 caterpillars, foldable butterfly habitat and detailed care instructions. Warning: choking hazard. Small parts, not suitable for children under 3 years. No caterpillars are included in this set.