Those are cormorant scars, I'm 100% sure. Some of my LMBs have the same scars, as you can see in the photos at the bottom of this thread http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=503926 .
The heron hits like a bullet and leaves circular holes.

Last edited by ItalyBASS; 04/25/20 09:36 AM.

Filippo