Mishnayos Bava Basra Perek 2 Mishnah 6

With regard to a dove chick [nippul] that was found within fifty cubits of a dovecote, it belongs to the owner of the dovecote. If it was found beyond fifty cubits from a dovecote, it belongs to its finder. In a case where it was found between two dovecotes, if it was close to this one, it belongs to the owner of this dovecote; if it was close to that one, it belongs to the owner of that dovecote. If it was half and half, i.e., equidistant from the two dovecotes, the two owners divide the value of the chick.

נִפּוּל הַנִּמְצָא בְתוֹךְ חֲמִשִּׁים אַמָּה, הֲרֵי הוּא שֶׁל בַּעַל הַשּׁוֹבָךְ. חוּץ מֵחֲמִשִּׁים אַמָּה, הֲרֵי הוּא שֶׁל מוֹצְאוֹ. נִמְצָא בֵין שְׁנֵי שׁוֹבָכוֹת, קָרוֹב לָזֶה, שֶׁלּוֹ. קָרוֹב לָזֶה, שֶׁלּוֹ. מֶחֱצָה עַל מֶחֱצָה, שְׁנֵיהֶם יַחֲלֹקוּ: