Enemies
At the time, Factorio has two type of enemies; Biters and Worms.
Biters
Biters will be our main problem in the game. They are the native inhabitants of the extraterrestrial world, and apart commonly they live peacefully with theworms. Biters are Artropodes's species that lives in group of constantly increasing number of nests and they spawn began small and grew up being medium and finally big biters (adult biters) and are very strong front us. Biters will attack our machines that produce pollution and later will kill us. If you look right you will see a common Biter's nest.
Small Biter:
Medium Biter:
Big Biter:
Worms
The worms are the natural allies of the Biters and will attack you if you get close enough. Worms will act like static turrets and will not follow you. It exists three types of worms like the Biters; small, medium and big worms, being big worms the most dangerous.