Just go pick them up- they'll generally raise a royal ruckus in protest, and you'll know for sure one way or the other. There's no way to mistake the hen's distinctive (and LOUD) quack, vs the drake's raspy "yeeb yeeb yeeb".
I wait until my ducklings are more or less fully feathered (6-8 weeks old), and even then I'm wary. The older birds tend to get really nasty towards the "intruders" and will harass, bite, flog and chase them around. If you try and put fuzzy babies in with them, they'll be ripped apart for...
I doubt it was a coon, though- like I said, the pen and shed are both "tight" (the pen is 15x25, the shed is 12x14). The vast majority of the scattered pieces & parts I found inside the shed, dragged into the very furthest, darkest corner. The remnants of the very last gosling (one foot and...
So far over the I've had something rip apart and eat a bunch of baby ducks and geese! All I find is scattered bits of fuzz and occasionally a foot chewed neatly off at the hock (usually laying out in the pen, but otherwise it's been dragged into the darkest corner of the shed). Other times...