Thousands of Hydrobia ulvae darkening the sand at the mouth of Dee Estuary, Cheshire. Active at low tide in film of water; note tracks in foreground. If film dries, snails burrow into surface completely, or partially.They support flocks of Shelducks.
Thousands of Hydrobia ulvae darkening the sand at the mouth of Dee Estuary, Cheshire. Active at low tide in film of water; note tracks in foreground. If film dries, snails burrow into surface completely, or partially.They support flocks of Shelducks.
Thousands of Hydrobia ulvae darkening the sand at the mouth of Dee Estuary, Cheshire. Active at low tide in film of water; note tracks in foreground. If film dries, snails burrow into surface completely, or partially.They support flocks of Shelducks.