how can you make your bots only cut big trees? it started cutting all the baby ones and i had to stop it.

also i have too much dung i think my dung pile is rivaling the burj kalifa

i don't think this matters because you won't have small trees when you start automating trees.  Also, big trees require seedlings which come from a seed tray.  And also also dung is used for fertilizer later on

Yeah right now Workers don't care about big or small trees, they're all the same. I'll add that to the bug list. 

And yeah stick your dung in the Fertiliser Storage for later use. Must be useful for something :)