Actually... the above is not recorded in the Gemara, but only on the Kitniyot Liberation Front blog. Nevertheless, the incident is 100% true.Rebbi Avraham, Rebbi Yose, Rebbi Shlomo and Rebbi Ariel were walking along the colonnade on the eastern side of the Temple Mount, near the area closest to the Holy of Holies.
As they walked along, Rebbi Yose came upon a carcass of a ben-yomo, a day-old bird, lying on the floor. Rebbi Avraham asked "What is the din [law]? Are we all ritually impure on Har HaBayit from contact with a carcass?"
Rebbi Shlomo said, "Just this week, we learned that contact with a carcass renders you impure, but this is only from a dead 'sheretz' such as lizard or salamander. But from a kosher bird, you are only impure from eating it. We can surmise that bird is kosher."
Rebbi Ariel looked up and saw the swallows that had built a nest under the roof of the colonnade. "These are probably the birds of the ben-yomo. Listen and you can hear the chicks in their nest. We have no reason to believe the bird is not kosher. Praised are the words of Rebbi Shlomo."
It occurred on the 5th of Iyyar during an ascent to the halachically permissible areas of Har HaBayit. This is a true example of Torat Hayyim, of Living Torah.
There is no better place to learn and live the Torah than on Har HaBayit, where the Great Sanhedrin learned the Law.
For information about ascending to to Har HaBayit, contact email@example.com.