MB3 152a: Eggs Laid on Shabbos (322:1-4)

An egg laid on Shabbos can't be eaten or moved on Shabbos on account of a Yom Tov that falls on Friday. An egg found first thing Shabbos morning when Sunday is Yom Tov.

An Israeli picking aravot for a ben chutz la'aretz on the second day of Sukkot.