Chulin6: 4
שָׁחַט מֵאָה חַיּוֹת בְּמָקוֹם אֶחָד, כִּסּוּי אֶחָד לְכֻלָּן. מֵאָה עוֹפוֹת בְּמָקוֹם אֶחָד, כִּסּוּי אֶחָד לְכֻלָּן. חַיָּה וָעוֹף בְּמָקוֹם אֶחָד, כִּסּוּי אֶחָד לְכֻלָּן. רַבִּי יְהוּדָה אוֹמֵר: שָׁחַט חַיָּה, יְכַסֶּנָּה, וְאַחַר־כָּךְ יִשְׁחֹט אֶת־הָעוֹף. שָׁחַט וְלֹא כִסָּה, וְרָאָהוּ אַחֵר, חַיָּב לְכַסּוֹת. כִּסָּהוּ וְנִתְגַּלָּה, פָּטוּר מִלְּכַסּוֹת. כִּסָּהוּ הָרוּחַ, חַיָּב לְכַסּוֹת.
[If] one slaughtered a hundred beasts in one place, one covering [suffices] for them all. A hundred fowl in one place, one covering [suffices] for them all. A beast and a fowl in one place, one covering [suffices] for them all. R’ Yehudah says: [If] he slaughtered a beast, he must cover it[s blood], and afterwards slaughter the fowl. [If] he slaughtered and did not cover [the blood], and someone else saw it, he is required to cover it. [If] he covered it and it became uncovered, he is exempt from covering [it]. [If] the wind covered it, he is required to cover [it].