Even after the eggs are laid and the chicks come along, the parents continue to bring sticks and other nesting materials to build up and/or repair their nests. I found this heron trying its best to break this stick off from the tree. You can clearly see the long breeding plumes coming off its head to one side.
Black-crowned Night Heron (Nycticorax nycticorax)
UT Southwest Medical Center Rookery