Yesterday my mom showed me this corner in Oakland where she heard has a lot of snowy egrets and night herons nesting. We checked it out and at first glance you don't see them, you just hear them, very loudly. After searching the trees, we soon discovered several nests and birds protecting their nests. I went back today with a zoom lens and was able to capture a few images. I think I was being warned to move away and getting quite the stare down.
Here's an interesting article about protecting the birds and why they nest here:
A few outtakes...