I live abroad and thus have no such way to give sadqa to those in need for example beggers etc. Can feeding the birds be a form of sadqa as well in that manner?

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Feeding the birds is a good deed and will be rewarded by Allah. But if you want the effect of a proper Sadaqa give it to someone in need, even if they are Christians. There are also institutions that accept Sadaqa (you man contact mosques in Oslo and elsewhere), and so you can give it to then