They drop cementing paste which is used for lots of things.

Basically just murder them for your own survival. Their purpose is just to be murdered for xp and oil. I recommend killing the quickly so you don’t feel bad.

Don’t follow it when it’s in the air or else you might find yourself in a ditch somewhere.

Press e to gather oil from pink ones or drink water from blue ones. They regain oil/water over time as well.

Make a pen use grappler to Bing it inside make sure there is no door then bring it and let go of your grappeler an place a door behind you = free oil or water

U can't tame this weird water filled giant firefly

The blue ones give you water and the red ones give you oil which is essential later on

You can use a grappling hook to drag them into a holding pen, and then you can continue to milk the bug

This thing can save your life on scorched,some of them give water,and other give oil.

Up to 16 oil for the red jug bugs