Aeshnidae Larva II

I went back to the pond that I visited 1-2 weeks ago, and I still found plenty of the aeshnid larvae. I caught a few more to bring back home for rearing. These larvae are large ranging at 30-36 mm. I put together 12 larvae in a big glass tank. To my horror these larvae practise cannibalism! They could take up a bait as big as their size.... totally incredible! Now I have to separate them. Below is a male larva with a size of 36 mm. I really don't know how much more it could grow before emergence.

male; the length of the bar is 10 mm