Hey, thanks for the reply! I didn't know that GG larvae are so hard to find in the wild. Given what we know about raising the larvae in captivity, can you speculate about their diet/habits in the wild? Let's brainstorm!
I'll start.
1) Goliath larvae need a high protein diet. If you place live insects in their vicinity, they will hunt the insects. Their high protein diet allows them to develop much quicker than Dynastes or Megasoma and are able to time their life cycle so that it corresponds to the annual dry/wet season in their habitat.
2) Goliath larvae are able to move pretty quickly (from videos I've seen), quicker than larvae of Dynastes or Megasoma, which is necessary if they want to hunt insects.
3) They don't eat rotting wood.
This suggests to me that they live in moist ground, not logs, and hunt insects or worms.
People must have seen where the adult females lay their eggs in the wild, right? This would give us a clue as to where the larvae live. Anyone have other ideas?