Wood Ducks

Here's a Wood Duck from early August. Normally this is probably our showiest waterfowl; I suspect this one is in its eclipse plumage. Eclipse plumage is a molting phase where the duck looks drabber and less colorful, and it's pretty important. Because ducks molt their flight feathers all at once, they go through a period when they're grounded, and are unable to fly. Imagine if you're one of the most colorful birds on the pond and you suddenly can't fly - to predators, you'd be a sitting duck!

To partially compensate for their temporary lack of aerial ability, these ducks become less conspicuous by donning their eclipse plumage. (Mallards do this too, and during eclipse plumage it's very difficult to tell the male and female Mallards apart.) And then when their flight feathers grow back, they molt off these drab colors and regain their flamboyant good looks again.

August 5, 2021 at Duke Farms
Photo 148952468, (c) jpviolette, some rights reserved (CC BY-NC)

It's also possible that this is an immature male, though they look even more like the females. I'd expect to see a little bit of a white eye ring and a less distinct white pattern on the head if this was an immature male. 

Below is what I think an immature male Wood Duck would look like. This duck has both a white eye ring and also the beginning of the white mark going up the side of its head. The former suggests it's not an eclipse male, and the latter suggests it's not a female.

August 4, 2021 at Raritan River Greenway
Photo 149027573, (c) jpviolette, some rights reserved (CC BY-NC)


Comments

Post a Comment

Popular posts from this blog

Northern Watersnake

Image
This April I went to Great Swamp National Wildlife Refuge with the hope (among other hopes) of seeing the Northern Watersnakes during mating season. There were 2 problems with this: I think it was slightly late in the season for this. The boardwalk trail where I had seen them in the past was partially closed due to repairs. So although I didn't see any of the 2+ intertwined snakes that I'd seen in the past, but there were still Northern Watersnakes warming themselves in the sun: April 13, 2023 at Great Swamp Photo 272117862, (c) jpviolette, some rights reserved (CC BY-NC) And here's another one coming out of the water. April 13, 2023 at Great Swamp Photo 272119139, (c) jpviolette, some rights reserved (CC BY-NC)
Read more

Female Brown-headed Cowbird

Image
Like quite a few birds, this bird is easier to identify when spotted with her significant other ; she's a Brown-headed Cowbird . Due to their tendency to be monogamous plus plain old birds-of-a-feather behavior, I usually see them with prominently brown-headed males around, greatly improving my confidence in IDing them. My understanding is that Brown-headed Cowbirds are the only obligate brood parasites in my area. Obligate brood parasites have essentially lost all their parenting skills, and thus if they were ever unable to fool other birds into raising their young, they would (almost certainly) go extinct [1]. There are, however, other brood parasites in New Jersey. These are called facultative brood parasites, and these birds will usually raise their own offspring, but will also engage in brood parasitism. (Exactly when birds perform facultative brood parasitism seems variable; one source said it occurred when resources were scarce while another said it occurred when resource
Read more

Rooftop Turkey Vultures

Image
I met these Turkey Vultures by just walking out of my apartment. (I theoretically could have gotten a picture without going outside, but that extra layer of glass can degrade picture quality a little.) Although they don't show up on these rooftops daily, they're not an uncommon visitor to my apartment complex. Similar to this spot of the woods , I wouldn't expect this to be a great place to find carcasses. I'm thinking they're here mostly because: They don't have to worry much about predators up there. They get a pretty good view of the area in case something should happen to succumb. (This apartment was near the top of a hill, providing a better view than most of the other apartments.) Since this picture was from February, it's probably a slightly warmer spot, especially near those furnace vent pipes. Although these are Turkey Vultures, it's also not unusual to see Black Vultures up there too. February 28, 2023 at Finderne Photo 264703396, (c) jpviole
Read more