"Bulldozing" trails left by a freshwater mussel of the family Unionidae, most probably the Duck Mussel (Anodonta anatina) or the Painter's Mussel (Unio pictorum) on a beach near Kurort. The shell partially visible at the end of the trail is large, oval, and relatively smooth with a dark, brownish-yellow periostracum (outer skin). St.Petersburg, Russia
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Thu 9 Oct 2025 11:14:06 - Exposure: 1/320 sec - Aperture: F/8. - Focal length: 100 mm - ISO 400
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Album 3764: Saint Petersburg - Sestroretsk, Russia, October 9, 2025
