Given that a yukkuri, in essence, is a sweets-filled pastry that is completely filled with carbohydrates and devoid of any real protein, isn't this a terrible thing to be feeding to young chicks?
Yeah, usually the only way yukkuris prevent animals eating them or at least killing them is through sheer numbers and Dosus, if they didn't have the numbers and Dosus my "Uneasy End" scenario would never take place, since animals in a way or other would kill them enough to prevent them overgrazingig the lands.
I tend to think of yukkuris as being all nutritional foods that morph to fit anything without negative health effects, but that's a convenient cover for the base law of yukkuris: Anything and everything will work impossibly and illogically to screw over yukkuris.
I didn't translate most of the background sound effects but in the second panel Maricha's "Yu" is interrupted by what seems like a crushing sound or some other kind of death sound of a squashed yukkuri. I looked it up and apparently it's the sound effect for a kiss but that didn't seem right.
The BUCHU sound? With the hard stop at the end, I agree that it's more likely the sound of violent biting, with possible crushing of something hard, like the paste core.