YOU SAID:

Later the same day a small flock was encountered, and "perhaps a dozen" birds were killed

INTO JAPANESE

後日、小さな群れが遭遇し、「おそらく十数個の」鳥が殺された

BACK INTO ENGLISH

Later on, a small flock encountered, "probably more than a dozen" birds were killed

INTO JAPANESE

後に、小さな群れが発生、「おそらく以上ダース」鳥が殺されました。

BACK INTO ENGLISH

Later, a small flock occurred, "probably more than a dozen" birds were killed.

INTO JAPANESE

その後、小さな群れが発生した。おそらく十数種以上の鳥が殺された。

BACK INTO ENGLISH

Then a small herd occurred. Probably more than dozens of birds were killed.

INTO JAPANESE

その後、小さな群れが発生した。おそらく数十以上の鳥が殺されたでしょう。

BACK INTO ENGLISH

Then a small herd occurred. Probably more than dozens of birds were killed.