https://news24.ch/2026/04/16/biber-siedeln-sich-in-basel-an-neue-biberburg-in-den-langen-erlen-entdeckt/Thu, 16 Apr 2026 07:22:39 +0000 https://news24.ch/2026/04/16/biber-siedeln-sich-in-basel-an-neue-biberburg-in-den-langen-erlen-entdeckt/83771