Mishnayos Chullin Perek 6 Mishnah 4

If one slaughtered one hundred undomesticated animals in one place, one covering of the blood suffices for all the animals and there is no obligation to cover the blood of each animal separately. Likewise, if one slaughtered one hundred birds in one place, one covering of the blood suffices for all the birds. If one slaughtered an undomesticated animal and a bird in one place, one covering for all of the blood is sufficient. Rabbi Yehuda says: If one slaughtered an undomesticated animal, he should cover its blood immediately and only thereafter he should slaughter the bird. If one slaughtered an undomesticated animal or bird and did not cover the blood, and another person saw the uncovered blood, the second person is obligated to cover the blood. If one covered the blood and it was then uncovered, he is exempt from covering it again. If the wind blew earth on the blood and covered it, and it was consequently uncovered, he is obligated to cover the blood.

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: