This Friday – Take a Bird to Lunch.
There is a minhag to feed birds on Shabbat Shira (better on Fri.) as an act of HAKARAT HATOV on two different levels.
There is an old custom to feed birds on Shabbat Shira. Note that there are halachic problems with feeding animals other than one's own on Shabbat. Sefer HaToda'ah, for example, says that one should provide for the birds on Erev Shabbat Shira, not on Shabbat itself.
The reasons given for this custom help us in a gentle way to become more sensitive to the needs of the animals around us.