Tree webs (I think)

In lots of the bushes on the sides of the road, bearing in mind that thats all there is out here mostly and they are about 1m tall, there are lots of spiders webs or white birds nests. I’m not sure exactly but they look like spiders webs. I vaguely remember reading/seeing/hearing something about spiders that catch small birds, this would explain how these things look. They look like there something in them that is quite heavy in comparason to the branch. Until I learn otherwise, I’ll believe its spiders catching small birds. I’ll have to look into it later.