If you’re new to beetle breeding, here’s a quick guide to help you understand some of the basic terms and stages in their development.
✅ Larval Stages. (Molting Stages)
L1 = 1st instar
L2 = 2nd instar
L3 = 3rd instar
✅ Prepupal stage.
This is the stage just before pupation. The larva stops feeding and starts to form its pupal chamber.
✅ Pupal chamber, Cocoons
Larvae build a pupal chamber (or cocoon) in the substrate to safely transition into pupae and eventually emerge as adults.
✅ Artificial Pupal Chamber (Oasis Foam Type)
You can make a pupal chamber using Oasis floral foam.
📌 Important: Only move thelarva once it has fully entered the prepupal stage (meaning it can no longer move its legs or jaws), or after it has pupated.
✅ Full Life Cycle.
Egg → L1 → L2 → L3 → Pupa → Adult
✅ Inactive periods (After Emergence)
Once a beetle has emerged (eclosed) as an adult, it enters an inactive period inside the pupal chamber or cocoon. During this time, they don’t eat or move much.
Duration varies by species, usually 1–2 months, but for some, it can last 6 months or longer.
✅ Maturity period
After emerging and going through the inactive phase, most beetles need about 1–2 months of feeding before they’re ready to mate. So in total, you’re usually looking at 2–3 months after pupation before successful pairing is possible.
🔎 Even within the same species, larger beetles often take longer to mature. So give them time and don’t rush it.
Patience pays off.
✅ Mating (pairing)
There are a few ways to pair beetles, but for medium to large stag beetles, it’s recommended to zip-tie the male’s jaws during pairing to prevent injury to the female.
✅ Generation Notation (How to Read Breeding Lines)
🔎 These notations help track bloodlines and maintain healthy diversity in breeding projects.
WD = Wild Caught
WF1 = Offspring of a wild pair. The next generation would be F2
CBF1 = Offspring of two different captive lines (cross-breeding)
F2, F3... = Subsequent generations from WF1 or CBF1 parents