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.

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.^^^^

Don’t try to tame Santa Gacha does not work

The Gacha can be carried by a quetzal. Just a little fyi