Eike,
question answered by Hagnat
Black Stork (Ciconia Nigra) and the Red list http://www.iucnredlist.org/details/22697669/0
last assessment http://www.iucnredlist.org/pdflink.111747857
the situation in Estonia here (EN) http://vana.elurikkus.ut.ee/kirjeldus.p ... oduskaitse
Category of threat (2008) Endangered (EN)
on that site the are also much very nice BS photos