What do i do with a baby bird?

[tomcatjak]

My sister found a baby bird and i dont know what to do with it, we cant find its nest and it is only like a day old.

 

[PomlMom]

In the US it is illegal to keep wild migratory birds.
http://www.fws.gov/laws/lawsdigest/migtrea.html
Take it to a wildlife rehabilitator and they will take care of it.
Do you know what type of bird it is?
Please do the responsible thing by taking it to a rehabilitator!