Quoting%20commentary for Bava Metzia 1:4

רָאָה אֶת הַמְּצִיאָה וְנָפַל עָלֶיהָ, וּבָא אַחֵר וְהֶחֱזִיק בָּהּ, זֶה שֶׁהֶחֱזִיק בָּהּ זָכָה בָהּ. רָאָה אוֹתָן רָצִין אַחַר מְצִיאָה, אַחַר צְבִי שָׁבוּר, אַחַר גּוֹזָלוֹת שֶׁלֹּא פָרְחוּ, וְאָמַר זָכְתָה לִי שָׂדִי, זָכְתָה לוֹ. הָיָה צְבִי רָץ כְּדַרְכּוֹ, אוֹ שֶׁהָיוּ גוֹזָלוֹת מַפְרִיחִין, וְאָמַר זָכְתָה לִי שָׂדִי, לֹא אָמַר כְּלוּם:

If he saw a metziah and fell upon it and another came and took hold of it, the latter acquires it. [This is so only when the metziah was in the public domain, for a man's four cubits do not acquire for him in the public domain. Therefore, the one who takes hold of it acquires it. But in an alleyway, which is a path for one person, or at the sides of the public domain, where there is no press of people, one's four cubits acquire for him any metziah and object of hefker close to him in that space, and no one else is permitted to seize it — a rabbinical ordinance to prevent contention.] If he saw them (men) running after a metziah, after a "broken" deer, [which cannot run and is "guarded" in the field if others do not take it, and which is like a metziah], and after birds which cannot fly, and he said: "My field has acquired (them) for me," it acquires (them) for him. [This, provided that he is standing at the side of his field and can run after them and reach them before they leave the field.] If a deer were running normally or birds flying, and he said: "My field has acquired (them) for me," he has said nothing.

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