This is a Marsh Wren (Cistothorus palustris).
The Marsh Wrens are quite difficult to see and photograph because they hide within the reeds of the cattails when people approaches them, but you know they are there because of the machine gun-like songs.
A medium-sized dark bird. At first, I was not certain what species this is because it is definitely not a Red-winged Blackbird (lacking the red "badge"). Looking closer, I noticed a hint of brown-color on the head, which means it could be a Brown-headed Cowbird (Molothrus ater). Then I heard its song that sounds like water droplets falling slowly into a pond, so I was quite certain that it was a M. ater. Awesome, another lifer for me.
Photographing these Yellow-rumped Warblers (Dendroica coronata) is a huge pain in the neck because they like to hop from branches to branches and never staying still for more than one second.
Tree Swallow (Tachycineta bicolor) resting.
American Goldfinch (Carduelis tristis) is one of the easiest birds to spot right now because they like to sing loudly for a long time, and plus they are one of the brighestest birds to spot in these leafless shrubs.
Have a good weekend, everyone!