Jim Williams has been watching birds and writing about their antics since before "Gilligan's Island" went into reruns. Join him for his unique insights, his everyday adventures and an open conversation about the birds in your back yard and beyond.

Posts about Bird biology

Birds moving north to nest

Posted by: Jim Williams Updated: August 11, 2014 - 4:23 PM

As our climate continues to warm, many species of birds we consider "ours" will move north in search of cooler temperatures. Minnesota will lose some of its favorite nesters.

Dr. Jeff Price, a climate scientist who presently is a visiting fellow at the University of East Anglia in Great Britain, a few years ago made bird-population projections for Minnnesota. He based this on a supposed doubling of atmospheric carbon dioxide, a projection for the end of this century.

In his scenario, Minnesota would lose 36 nesting species of birds. We might see those birds in migration but not as nesting residents. That list includes Red-breasted Nuthatch, Purple Finch, Evening Grosbeak, and 17 species of warblers.

An additional 27 species would find their range restricted to far northern Minnesota, perhaps just the Arrowhead region. Gone from our yards would be American Goldfinches, Tree Swallow, White-breasted Nuthatch, House Wren, Gray Catbird, Scarlet Tanager, Rose-breasted Grosbeak, Chipping Sparrow, and Song Sparrow, to mention a few. 

We would drive to Duluth or beyond to see a goldfinch, if Duluth’s climate was suitable for goldfinches.

We should note that the projections do not mention particular habitat needs moving north at the same pace. That will not happen, of course, plant movement to be centuries behind that of birds.

Black flies and Osprey chicks

Posted by: Jim Williams Updated: July 23, 2014 - 4:07 PM

According to the blog of the Twin Cities Osprey Watch, Osprey chicks are believed to be dying of bites from Black Flies, the insects raising havoc throughout the state. Deaths and abandoned nests are reported for species ranging from Common Loons to barnyard chickens. To follow this blog go to http://ospreywatch.blogspot.com

Birding Community E-bulletin

Posted by: Jim Williams Updated: July 21, 2014 - 1:06 PM

Birding Community E-bulletin for July 2014. Always interesting, the bulletin contains short takes on news of birds and bird conservation, including a summary of rare birds seen in North America during the previous month. The archive contains issues from 2004 to the present.


Black flies in silent attacks

Posted by: Jim Williams Updated: July 14, 2014 - 9:13 AM

I have Black Fly bites, four of them large enough to be seen from across the room. This doesn't make me exceptional. It does make me itch. I was in Caledonia Saturday for a meeting of a Quail Forever group, devoted conservationists focused on Northern Bobwhite. Minnesota has a few of those birds in Houston County. We were sitting in a farmyard at picnic tables beneath large shade treess, all very pleasant. I noticed a small flying insect on the table in front of me, and smacked it. Dead but intact, it offered close examination. I thought I could recognize the humped shape of a Black Fly, the shape that gave them one of their several folk names -- Buffalo gnat. Speaking to the group briefly about birds I mentioned the Black Fly problem in central and northern parts of out state. While I was talking a cell phone rang, a member of the small audience having a short conversation. He happened to be a veteranarian. The call, he told us, came from a local DNR biologist who had just arranged transportion to The Raptor Center in St. Paul for a Bald Eagle chick so bothered by the flies that it crawled out of its nest and was injured in a fall to the ground. There was some surprise that the flies were attacking birds way down there in Houston County. A few hours later Thurman Tucker, active QF member and advocate for the species disappeared from lunch. Unannounced, he was hurrying home to Minneapolis, so many fly bites on his face that one of his eyes was almost swelling shut. My bites weren't apparent until I got home, and my wife took a look at me. The one on my left temple is the size of a half dollar coin, the one inside my left elbow quarter-size, the bites on the back of my neck no more than a nickel. No itching last night, but they itch like blazes. I felt no bite nor any insect on my skin while being bitten, an absolute stealth attack. There were no swarms around our heads, thankfully, like the swarms seen on and around heads of Common Loons, one of the bird species under particular attack. The fly I killed on the table was about 1/8th of an inch long. I wonder if bites received by birds swell, and do they itch? Is it the attack itself which drives birds to distraction and death or is it the aftermath, the swelling and itch? 

Monday morning -- I also wondered about the impact of the files on domestic and wild mammals. I await information from the University of Minnesota Extension Service. I did visit with a vet in Duluth, assuming that the flies have been or are as much as a problem there as anywhere. The doctor with whom I visited said she had seen no cases of noteworthy response to fly bites on pet animals. I found remarks concerning livestock on a web site in Europe (these flies are everywhere). Swarms of flies are said to send cattle and horses into panic-driven runs. Hundreds of bites on one animal can produce enough stress and/or allergic reactions to cause death. Flies can gather in nostrils and throats in numbers sufficient to suffocate the victim. I can find no such local reports. The good news is that the flies have a life span of about a month, hatching basically an event occurring broadly at the same time. We are soon to find respite. 

Here, from the Internet, is a photo of a black fly, hardly looking like the terror it can be.

Hummingbird nest

Posted by: Jim Williams Updated: July 20, 2014 - 5:43 PM

The nest of a Ruby-throated Hummingbird is being watched at a park location in St. Louis Park. Eggs are are close to hatching, although exactly when is unknown. Incubation takes about 16 days, young birds leaving the nest about 19 days after hatching. The nest is made of plant material and down held trightly together with spider web. It is covered on the outside with flakes of lichen. The female bird, working alone, builds the nest in about five days.


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