I've been a fan of sconine's Mechanical Animals since I first got my printer. I printed out the parts a few at a time over the last couple of years, and finally finished them recently.
But I always felt like the chicken was a little too small. Sure, a chicken is smaller than a dolphin, but so is a gopher. So I scaled it up slightly and thickened it up a bit to look better alongside the other animals in the set.