I need to do chores today, so I instead used my procrastination energy here! It's the molar of a herbivore. Here's what I have:

Definitely not beaver. Beaver incisors are orange and shaped very differently and it's far too large to be a beaver premolar or molar. Wrong morphology anyhow - beaver pre/molars are plicated and this is not. It's also not from a muskrat based on all the same criteria but the plication.

It's definitely from a bovid, not from a caprid or equid. Equids tend to have these bizarre columnar molars, and caprid molars are too small and the wrong shape. Since you're in Germany, that leaves us with cows and European bison.

It's the first or second molar from one of those based on the two cusps; if it had three cusps, it'd be the third molar. What clinches it is the asymmetrical gap in the roots (called a furcation area). Cows have a gap right in the middle of their first and second molars, whereas bison have an off-center gap in their first molar.

Congratulations, you have a bison M1!

Cow X-ray

Bison X-ray

Looks to me like it's from a creek in Germany.

Can you take a photo next to a euro coin, for scale?

I found a very similar one, also in Germany, many years ago. I figured mine was a cow tooth, although I'm not sure how old it was. Most people no longer kept cows in that town at the time that I lived there.

Germany, you say? It’s local name will be something with WAY too many letters.

Edit: Relax, folks. ALL languages are kinda messy in their own way. There’s a difference between a good-natured joke and heartfelt criticism. I’m not criticizing anything. Plus, I’m speaking English, which is an absolute dumpster fire.

As others have guessed, this is a bovid tooth, Bos taurus (cow).

Bison/bovine