A friend recently commented that she went by the rookery and not a lot was going on. But that was a few days ago, and the action is picking up at this point. The birds are flying in and out, building their nests. Once most of the nests have eggs there will be a lot of birds on nests, and that is a lot quieter. Until the chicks hatch and the decibel level goes up. Way up.
Once they have eggs the birds will be laying in the nest, only getting up to reposition themselves. After a couple of weeks you begin to hear the babies calling out to be fed. You hope that they will be bobbing up and down in a nest that you have a view of from the sidewalk, and eventually that will be true. The cycle of life.
A Snowbird's Life Through the Lens 