When an enemy unit or worm dies it tries to reincarnate back in to nature, be it a tree, rock, cliff or water. Occasionally the angry biters can burst into a flaming tree.
I am no longer supporting or developing any mods. This mod is believed to work with Factorio 1.1 without any major issues.
If you wish to port or this mod for Factorio 2.0 or utilise any code from it under the inactivity clause in the existing license you have my blessing and encouragement.