Here's the reason I'm so staunchly defending my choice of 5/64 7x7. I tried to copy paste the text but couldn't make it happen. Text and pic courtesy of Rally Hess. He snares unbelievable numbers of beaver.
This is from the first link I posted, it gets good on page 3. He catches the odd muskrat in beaver snares and had to switch from 5/64 7x7 because he was catching too many otters.