So Few Birds, Where Are They

I didn't count as many birds as I did last year. I counted 15 Sparrows last year, this year there were only 4, where have they gone. It is the same with the Starlings. Although there wasn't as many birds to count it was still very enjoyable. I only saw 1 Blackbird and he is such a bully. If  anyone tries to take his meal worms he chases them away. It was a very enjoyable hour.