File:NABU logo low resolution.jpg

Summary
The logo of the Naturschutzbund Deutschland.

Fair use rationale for Naturschutzbund Deutschland
The image linked here is claimed to be used under fair use as:
 * 1) it is a historically significant logo of a large, widely known, charitable organisation;
 * 2) the logo is only being used for informational purposes;
 * 3) its inclusion in the article adds significantly to the article because it represents the subject of this article.