Colourful shelducks can be seen displaying. Watch out for swifts, swallows, sand and house martins which regularly feed over the pools. Try and spot elusive garganeys as they start arriving for the breeding season, or even a resting spoonbill.
Look out for black-tailed godwits returning from Iceland, many still in their rich, ruddy breeding plumage. Early migrants such as ringed plovers, little stints, ruffs and sandpipers may be seen as they start to head south on migration.
The marsh comes alive with flocks of redshanks, greenshanks and dunlins, together with hundreds of curlews, as they all gather for the high tide roost. Look out for passing ospreys fishing in the upper estuary or even perched up on posts and trees.