Insect Lore Live Praying Mantis Egg Case 75 to 200 Praying Mantises can hatch from one egg case! Please allow 4 to 10 weeks to hatch. Observe and feed your praying mantis tiny insects (like aphids, not included) for a few days, then release it to forage for garden pests. Egg Cases are available from mid-January to the end of June, while supplies last. Shipping of Live Egg Cases is limited to the Continental USA; we cannot ship to Alaska, Hawaii, Puerto Rico, Mexico and Canada.