Judgment of the Court (First Chamber) of 26 February 2026.#Umweltorganisation VIRUS – Verein Projektwerkstatt für Umwelt und Soziales and Others v Amt der Niederösterreichischen Landesregierung, Abteilung Landesstraßenplanung – ST3.#Request for a preliminary ruling from the Bundesverwaltungsgericht.#Reference for a preliminary ruling – Environment – Conservation of wild birds – Directive 2009/147/EC – Prohibition on deliberately disturbing birds – Article 5(d) – Project for the construction of a road involving the possibility of disturbing certain specimens of certain species – Measures for preventing and mitigating disturbances – Proof of the effectiveness of those measures – Reasoned assessment of a court expert.#Case C-131/24.