Just harvest stone and drop it on the ground near them to tame. Crystals and gems work too, but stone works best. Much easier to gather than owl feces. Up vote so everyone knows.

Gachas are a passive tame creature. Like so dododex can see

Don’t know why it’s not listed but greenhouse ceilings are way better than metal structures to tame these. Even on 1x rates 150 GH ceilings will tame a 150 in seconds with almost 100% effect

Warning. Using snow owl pellets no longer gives high efficiency. It is only as good as using stone structures.

Feeding greenhouse ceilings has around the same taming effectiveness as metal and tek structures. Get this added to the calc.^^^^