Below you will find a list of links and files to download related to EU enlargement and the Natura 2000 network.
The document Natura 2000 and EU enlargement outlines some of the basic information surrounding this matter.
For the 2004 enlargement the summary of changes introduced to the Habitats Directive is available here and for the Birds Directive here.
For the 2007 enlargement the summary of changes introduced to the Habitats Directive is available here and for the Birds Directive here.
The DG environment website on the Habitats Directive and Birds Directive give additional information on this process.