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An excellent place for finding rare eastern vagrants, and loads of passerine birds are the islands of Stockskär and Häradskär.
No less than 244 bird species have been recorded on the islands of Stockskär and Häradskär. In March the migration of Eider starts. Thousands of of them can bee seen migrating past the island if the weather is okay. At the same time the first Prundăraș gulerat mare, Călifar alb, Scoicar and Fâsă de stâncă can be seen in smaller numbers. You can also see smaller amounts of migrating marine ducks and loons, but only in small numbers. At this time the first auks also arrive.
In April the spring birds continue to arrive. The migration of marine ducks continues, and sometimes hundreds of Rață cu cap negru might be seen migrating. Sometimes a couple of Corcodel mare, Corcodel de iarnă and Corcodel cu gât roșu can be seen resting or passing. The first terns also arrive in april.
In May large number passerine birds arrive. Hundreds of warblers can bee seen resting on the island on their way north. Some birds who are numerous during this season are Codroș de pădure (as many as 50 have been seen in a day), Silvie mică (as many as 750 have been seen in a day), Silvie de câmp (as many as 50 have been seen in a day), Pitulice fluierătoare (up to 500 have been seen in a day), Silvie cu cap negru (as many as 150 have been seen in a day), Pitulice fluierătoare (as many as 500 have been seen in a day), Pitulice mică (as many as 40 have been seen in a day), Pitulice sfârâitoare (as many as 75 have been seen in a day). Most passerine birds are seen around the 10th of May. Along with theese birds you can find many rare ones like Gușă vânătă (relativley common) Muscar gulerat (possible if the conditions are right), Muscar mic (seen almost every year) Codroș de munte (seen every year), Ciuf de câmp (seen almost every year) Mierlă gulerată (seen some years), Fofecuță bălțată (some years) Presură mică (seen only some years). In May large amounts terns also pass the islands, sometimes in the hundreds.
After May has passed it is not until September that the islands start to become rich in birds. The migration starts with passing Corcodel cu gât roșu. A few passerine birds also rest on the island on their way south. Like Grelușel pătat (rare). It is in the middle of September that the waterfowl starts to migrate south which continues all the way into September. Starting with marine ducks and dabbling ducks. Most common are the Rață neagră (as many as 4400 have been seen migrating in a day), Rață catifelată (as many as 3400 have been seen migrating in a day), Ferestraș moțat (as many as 770 have been seen migrating in a day), Rață fluierătoare (as many as 3600 have been seen migrating in a day) who can be seen in the thousands migrating. Later in the season Gâscă neagră starts to migrate south often in the thousands.
In October/late September the large amounts of passerine birds return, this time with hundreds of Aușel cu cap galben (at most 600), Măcăleandru (at most 300), Ochiuboului (at most 400), Cojoaică de pădure (at most 120), Inăriță (at most 800), Sturz cântător (at most 500). In autumn ringing is carried out at Häradsskär. Along with these birds it is not rare to find a rare warbler or pipit like Pitulice cu sprânceană galbenă (almost every year), Pitulice mică (the siberan subspecies tristis is regular at the island), Pitulice sprâncenată (in total 10 of this vagrant have been seen on the island). The islands are quite attractive to many birds and the place has a quite long list of vagrants. This island also has the only 2 records of Grelușel siberian in Sweden. In no other place has this bird been seen, but here its been seen twice.
The boats to Häradskär start from Fyrudden harbour. Getting to Häradskär with a ferry costs from 400 SEK per person (evening trip to Häradskär with Skärgårdskompaniet, see the link below for more info). Taxi boats are more expensive, but you can choose when you want to go.
The ringing of birds is carried out in autumn.
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