What is the current online status of the Museum für Naturkunde's Tierstimmenarchiv? If it's not available, please explain why and provide the email address for inquiries about its status or the data portal it is part of.
Navigate to www.museumfuernaturkunde.berlin. Use the website's search function to find 'Datenportal'. Click on the search result that leads to the 'Data Portal' page. Read the content on the 'Data Portal' page to determine the accessibility of the animal sound recordings (Tierstimmenarchiv). Identify the reason for its unavailability. Locate the contact email address for inquiries about the data portal. Synthesize the findings to answer the task.
State that the animal sound recordings (Tierstimmenarchiv) are currently unavailable online because they are part of the inaccessible data portal. Correctly identify 'cyber attack' as the reason for the inaccessibility. Provide the specific contact email address: 'portal@mfn.berlin'.