Small bite marks on duck bill

[Yooperducker]

This morning I noticed 3 of my Pekins has blood streaks on their bill. Once cleaned off it appears on one to be definite bite marks. Two, small, slightly gouged marks. The other two are similar but not as defined. I looked fir tracks in the snow (yes really we still have snow) but saw none. What I can see of the duck house seems secure although some of the plastic is pulled away. Ant thoughts and how best to treat injury. Luckily it appears to be minor.

Dies anyone have an idea of what it could be? I am in the north woods. A mouse or squirrel possibly? That is what I the marks bring to mind.

 

[Yooperducker]

Apologies for the Auto correct errors.

 

[kittycat1356]

If they look like vampire bite marks maybe a stoat/ weasel

Rodent bites look more like
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(hard to explain almost like a gouge.) while an animal with sharper canines would have
. .
Marks