I claim no knowledge of the "working classes" of yinglets, but I'd imagine someone has to fix everything when it breaks. And with how accident prone these delightful rat-birds are, well it's probably a full time job. I'm sure having to fix the same thing day in and out would ruffle anybodies fur.
Tarken is a fan character
Yinglets belong to the very talented Valsalia. Go check out their comic! http://www.valsalia.com/