FINCHforum

Not sure about the lines..It the missing body that concerns me

Okay, seriously, could it be a stain? Does it look like it is cracked? Could it be a piece of thread wrapped around?"
I have never seen dark lines on a beak before.

Maybe the finch caught a small insect or spider and was in the process of consuming it - just the wiggly legs poking out the side of the beak?

Good call... bug legs...I didn't even think of that