I’m quoting from Jodi Magness’
Stone and Dung, Oil and Spit: Jewish Daily Life in the Time of Jesus (Eerdmans, 2011, pp. 47-48.) She is talking about how poultry bones are completely absent from the archaeological record in Qumran, suggesting that the sectarians who lived there did not consume them.
A second passage in the Temple Scroll might explain why even permitted species of fowl such as chickens are unrepresented among the animal bone deposits at Qumran:
…] … …] to enter my city …] a cock (or chicken; trngwl) you shall not rai[se …] (tgdlw) in the entire temple …] the temp[le …] (11Q21/11QTc)
Elisha Qimron notes that although the words trngwl and “to raise” [animals] do not occur in the Hebrew Bible, they appear together in rabbinic literature:
They do not rear chickens in Jerusalem, on account of the Holy Things, nor do priests [rear chickens] anywhere in the Land of Israel, because of the [necessity to preserve] the cleanness [of heave offering and certain other foods which are handed over to the priests]. (m. B. Qam. 7:7)
Although chickens are a clean (permitted) species, some groups apparently sought to ban them as well as dogs from Jerusalem due to purity concerns. The polemics of 4QMMT (and the lack of rabbinic concern) suggest that dogs wandered freely around Jerusalem and perhaps scavenged sacrificial remains. The Mishnah’s reference to a ban against raising chickens in Jerusalem might reflect similar concerns about scavenging. If such a prohibition existed, however, it does not seem to have been enforced, judging from the discovery of poultry bones dating to the late Second Temple period in Jerusalem. A bizarre incident recorded in the Mishnah also attests to the presence of chickens in Jerusalem before 70:
R. Judah b. Baba gave testimony concerning five matters: … that a chicken was stoned in Jerusalem because it had killed a human being. (m. 'Ed. 6:1)
I could not emphasize that part enough.