Reference for Kinnim 2:2

כֵּיצַד. שְׁתֵּי נָשִׁים, לָזוֹ שְׁתֵּי קִנִּים וְלָזוֹ שְׁתֵּי קִנִּים, פָּרַח מִזּוֹ לָזוֹ, פּוֹסֵל אֶחָד בַּהֲלִיכָתוֹ. חָזַר, פּוֹסֵל אֶחָד בַּחֲזִירָתוֹ. פָּרַח וְחָזַר, פָּרַח וְחָזַר, לֹא הִפְסִיד כְּלוּם, שֶׁאֲפִלּוּ הֵן מְעֹרָבוֹת, אֵין פָּחוֹת מִשְּׁתָּיִם:

How is it? If there are two women, this one has two pairs and this one has two birds and one bird flew from this woman's [pair] to the other woman's [pair] , it invalidates one bird by its leaving. If it then returned [to its original pair] it invalidates one by returning. If it flew back and forth multiple times it does not cause further invalidation since even if they are mixed up, there are at least two [valid] birds remaining.

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