why do birds sing?

It there nature. Mind if i ask a favor. can you post something with more sense?

i think birds enjoy their life as they can fly in the sky and that's why they sing with happiness.

Because they can.Are You not singing now?That is how they express themselves.

why does the sun go on shining...? why does the sea rush to shore ...? dont they know ..its the end of the world ..coz...you dont love me ..anymore.. you posting this song , right?

They don't actually sing. As far as I know, it's their instinct

i know two things why do birds were singing, first they sing because they are grateful to their creator that God allow them to have some space here on earth the and they are praising Him, they cannot stop singing because they know that God loves them so, you know whey they even live without toiling under the sun. and second why do birds are singing its the sign where they are communicating to each other just like us we talk because we communicate

to attract a mate and to warn other mates to keep away

I think it's to provide is with sounds kind of like music.