Nervous Nellie Bird - aka Song Sparrow

I think the Song Sparrow is a rather funny bird. He skitters back and forth between the Saskatoon bush and the seeds the Chickadees drop from the feeder and hops about in a very nervous fashion. I have nicknamed him the "Nervous Nellie Bird".  He very rarely makes a pleasant song either, more an insistent cheep.  He's always about and is fun to watch, but I always forget his proper name and just call him "Nervous Nellie"!