When playing in my normal world, I created an enclosure for my armadillo with hoppers on the floor to collect his scales without having to use too many brushes. But after an hour and a half of playing, I realized that it generated a lot of scales, almost a pack and a half. I don't know if it's a bug or the default setting, but it would be nice if the mob dropped fewer items to make better use of the brushing mechanic.
MC-271147
Armadillos shed a lot of scales
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According to the wiki (https://minecraft.wiki/w/Armadillo#Drops), the default drop rate is one scute every 5-10 minutes (the same rate as chickens laying eggs). In an hour and a half (90 minutes), you should have collected between 9-18 scutes per armadillo (somewhere between 6 and 11 armadillos will give you a stack and a half in this time). If you collected significantly more scutes or had fewer armadillos, this is likely a bug.