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Did anyone posek that penguins are (non)kosher?
Well, the same question might be regarding the swans.
The Sonchino edition Talmud Bavli, Chullin 62B says:
"R. Huna said: Bunia is permitted parwa is forbidden"
And in the footnotes:
"The penguin and the sea mew respectively."
How do they know that bunia is the penguin indeed? (Did our sages even saw penguins?)
From here
Regarding birds, the situation is much more complex. The Torah lists twenty-four species that are non-kosher. All others are acceptable. Thus, in theory, if a person knew the precise identity of all twenty-four listed birds, all others are acceptable. Today we no longer know what those birds are. This is the reason that both Rabbi Samson Raphael Hirsch and Artscroll chose to transliterate rather than attempt to translate the names of the birds in their Torah translations. Because of this, for close to one thousand years, the overriding principle is “Tradition!” The only birds that are treated as kosher are those for which a reliable tradition exists that in the previous generation it was treated as kosher.
