help for one, 3 pics
Posted 23 October 2012 - 04:22 AM
I am not good enough to identify your bird myself, but I think that those who are might ask the date and location where your pictures were taken. That is information you should generally provide with any photos of birds you want help to identify here..
Posted 23 October 2012 - 07:15 AM
Now as I was saying, this is all the same bird here. I snapped it from a distance down our treeline with full zoom. July 2, 2012 during the day in eastern WI. I went down the WI wiki list, paged through some books, and I has nothing! It looks bigger than a warbler or sparrow--it isn't no thrasher me thinks. IDK
Posted 23 October 2012 - 08:47 AM
Posted 23 October 2012 - 12:29 PM
Gwinnett County: 172
Listen, watch, bird.
Posted 23 October 2012 - 02:05 PM
Brown-headed Cowbird thirded. The little bird above it looks like a Hooded Warbler maybe?
It's hard to be 100% sure on the warbler in his picture, but Hooded was my thought as well. Location and date would help though. Guessing mid summer.
ABA list: 295 Latest: Swamp Sparrow
Yard List: 85 Latest: Violet-green Swallow, Tricolored Blackbird
I may live in San Diego County, buy my home and heart will always be in Missouri.
Posted 23 October 2012 - 07:48 PM
That is a young Brown-headed Cowbird. They are a brood parasite. The female Brown-headed Cowbird lays it's eggs in another birds nest (usually one per nest.) They generally pick smaller species than themselves, so the baby cowbird quickly outgrows and dominates it's foster nestlings, usually leading to their demise. In your third pic, you can see the cowbird begging food from the smaller warbler type above it (it's foster mother.)
Wow, nice catch! Just to be annoying, I might add that the parent bird could also be the foster father. (Unless you're seeing much more in it than I am, and are sure of its sex!)
http://imageshack.us...59/img2730u.jpg (Zoom in.)
Posted 23 October 2012 - 08:54 PM
Posted 23 October 2012 - 10:49 PM
Posted 24 October 2012 - 01:16 PM
Posted 24 October 2012 - 10:51 PM
Actually, cestma, if you look a bit farther, you'll find that the entire genus of Cowbirds are nest parasites -- and most of them are tropical. There's also been some phylogenetic comparative stuff that suggests that the process starts as specialists and expands to generalists (at least that's the direction I think it went in). Which implies, to me at least, that the nomadism we find in Brown-headed Cowbirds wasn't the pressure that started the parasitism, but may well have been part of the transition to the ultra-generalist pattern we see in them.
I stand corrected! Thank you--nothing worse than purveying misinformation. I did attempt to look further, only to run into the paywall fortress, so grabbed my Gill textbook and, whaddaya know, in addition to a nice discussion of brood parasitism in general it has sidebar devoted to exactly what you mention, complete with a phylogenetic tree. Ultra-generalist, indeed! By a couple of orders of magnitude from the one-host species. Wow. The more you look, the more fascinating it gets.
Posted 24 October 2012 - 10:54 PM
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