Summary


The Mishnah (044) said: “If he prepared three birds and found two; they’re permitted.” The Gemara explained because these are the same birds only that one flew away.We learned a Beraisa regarding Maaser Sheini money: If one prepared two hundred and found one hundred: Rebbi: One hundred was removed and the second hundred remained in place. Chachomim: It is all chullin.It seems then that our Mishnah follows the view of Rebbi. But the Gemara explained in the name of  Rabbi Yochanan and Rabbi Elazar: Birds are different because they hop away.
Challenge: Regarding that Beraisa of Maaser Sheini we learned:Rabbi Yochanan and Rabbi Elazar: One of them [A] explains that the debate [of Rebbi and the Chachomim] is only with regard to money in separate purses [only then will Rebbi hold that one purse was taken while the other was left in place] but if all the money was in one purse, everyone agrees that all the money would have been removed simultaneously.And one of them [B] explains that the debate [of Rebbi and the Chachomim] is only with regard to money left in one purse [only then will the Chachomim hold that the entire purse was replaced] but if the money was in separate purses, everyone agrees that the remaining purse was not exchanged.Since the case of the birds can only be compared to the case of separate purses, the fact that Rabbi Yochanan and Rabbi Elazar both needed to explain that birds are different [because they hop away] is difficult. This explanation is only necessary according to one of them [A]. According to [B] the case of the purses is in agreement with our Mishnah and raises no difficulty!
Rav Ashi: Our Mishnah discusses birds which are bound together. And the purses, too, are bound together [one purse doesn’t mean ‘one purse’, it means two purses bound together]. Since birds hop around, their bonds will loosen, but a purse will remain as ‘one purse’. Rebbi, on the other hand, maintains that even a bound purse could have been separated. 
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