Is there a prohibition on eating meat and poultry together?

Question

Although I knew about the prohibition of eating fish and meat together, and also about the quite serious restrictions in my community on eating dairy and fish together, I had never heard that we are prohibited from eating meat and fowl together...until now. Is this prohibition observed today, how strict is it, and what must be the separation between meat and fowl? (Do you need to have, say, something solid to eat and a glass of whiskey to drink as we are supposed to between fish and meat?)

^Bonus: why does nobody seem to do this last part?

Answer 1

That is a mis-translation. This is the Hebrew text:

קיצור שולחן ערוך סימן לג

אסור לאכול דג עם בשר, ואפילו עם שומן עופות מפני הסכנה.

Translated (by me):

It is forbidden to eat fish with meat, even with goose fat, because of a danger.

Which means that one should not each fish with meat or fish with goose fat (poultry). I'm pretty sure it's not just goose fat but all poultry, but not sure why goose fat was picked as the example. Perhaps that is how fish was cooked in those times....