Thank you for the question on the reference of “birds” in the Bible, “When is the first time “birds” are mentioned in the Bible in the King James Version?”
If the question refers to a generic references to wing creatures, then Genesis 1:27 is the first reference to “birds”. The creation of winged fowl would have to be in pairs otherwise that kind of bird would be extinct. In other words, God didn’t create just one of each kind, but at least two if not more. The command to multiple would infer more than one bird. The text does not state how many were made but is likely more than two. That’s just my opinion.
Genesis 1:21 says this, “And God created great whales, and every living creature that moveth, which the waters brought forth abundantly, after their kind, and every winged fowl after his kind: and God saw that it was good. 22 And God blessed them, saying, Be fruitful, and multiply, and fill the waters in the seas, and let fowl multiply in the earth” (NIV).
Genesis 1:21 states that God created every winged fowl after his kind on the fifth day of creation. This is confirmed in Genesis 2:19–20 when Adam names the animals and the birds/fowls.
If the question relates to a specific name of the bird, this is cited in Genesis 8:7–8 refers to a raven and then a dove was sent out by Noah from the Ark.
Whether the English translation of “raven” or “dove” may be subject to debate since the language used prior to the Flood is clearly known.
SUMMARY: Genesis 1–2 is the first generic reference to birds while Genesis 8 refers to the first specific reference to the identity of a bird.