Certain birds let you know when you are too close to their nest and will try to lead you away from their nest, dive bomb your head or start squawking at you. The Red-winged Blackbird gets rather noisy when too close to the nest and soon both the female and male are making a fuss until I leave the area. The female was trying to feeding her babies when I spotted the nest and she wasn’t happy with me. At least this nest I could get to since most of the nests are over the water as the Red-winged Blackbirds like to build their nest among the cattails.
Red-winged Blackbird Babies