The server of the Serbian Biological Society and the Archives of Biological Science will be under maintenance from Saturday 19 May, to Sunday 20 May. Therefore, all users – readers, authors and reviewers of the Archives of Biological Science, will not be able to reach the site at some point. We will invest all effort to make this time as short as possible. However, the landing page for DOI of all published papers will be available at doiSerbia (http://www.doiserbia.nb.rs/journal.aspx?issn=0354-4664), the portal of the National Library of Serbia, which presents all scientific papers in Serbia in CrossRef. We apologize for this inconvenience. Thank you for your understanding.