As far as I know this has never been documented. I came home from work just before and did my usual check of my collection. I have 3 angle headed dragons, one hatchling and an adult pair. I had been slowing down on the feeding of the adult female because she has a tendency to put on weight. I was feeding her 1-2 large crickets a day, now shes on just 1 medium a day. Antway, when i looked in the enclosure I saw her on the ground, her throat pouch vastly extended, and my first thought had been correct. She had eaten the hatchling dragon, something I was told shouldn't happen yet had my concerns about. She seemed to have difficulty breathing and the sharp spinal scales could have been causing her pain, so I got some tweezers and opened her mouth and removed my poor little dragon. I am a bit sad about losing him, he had a lot of personality and used to 'head bob' frequently. But i'm glad my female is looking ok, i think i will increase her food, stuff obeisity!