Mission: To promote the appreciation of wildlife and increase harmony between humanity and nature.

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Saturday, September 29, 2018

The Blue-Grey Acorn Jay

A California Scrub-Jay near Salmon Creek in Vancouver Washington.

I like this photo because it catches the bird in what I call a corvid hop. At first glance one might think the bird is standing on the ground. A careful examination of the shadow causes a mental re-adjustment. Suddenly, the bird appears airborne, without the use of wings. Our local American Crows and Steller's Jays do a similar maneuver as this their corvid cousin - the California Scrub-Jay.

I have been hoping to photograph a Scrub-Jay near Union Bay for quite some time. Earlier this year, my friend Whitney saw a group of them near Agua Verde. They were gone by the time I visited the area. Scrub-Jays are more common further to the south but occasionally a few wander north.

Earlier this month, my friend Dave Galvin heard a California Scrub-Jay as he biked through Montlake. The next morning, I visited the specific area but sadly I saw only Steller's Jays. 

The same day, I joined my friend Eric's bird walk near Portage Bay. In part, because I wanted to ask Eric if he had seen any Scrub Jays lately. He pointed out a tree where he observed one the day before, but none appeared for me.

This week, while visiting my mother in Vancouver I finally secured a few photos. Vancouver is inside the normal range for California Scrub-Jays so finding them was not too challenging, however it did not really satisfy my desire to see them near Union Bay.

The beauty of this jay is an excellent reward for those who spot one. I am always amazed by the hues and colors of blue birds, especially since their feathers do not have any internal blue coloring. It is the physical structure of the feather which causes it to reflect light in the blue wave length. 

This makes me wonder if a scientist were to crush a blue feather, destroying the internal structure, what would be the color of the resulting powder? Would it be grey like the cheeks or the back of the jay or a shade of white like the belly or bib or some other completely unexpected color? 

In this photo, taken with out direct sunlight, why does the blue color appear richer? If blue is a reflection of the light why would less light seem to create more color?

For comparison, here is a bird in a similar situation, except for the addition of direct sunlight.

I wonder if the bright white of the bib and the supercilium and the off-white of the belly are structurally different from the blue feathers or do the whitish feathers contain white pigmentation.

It is also interesting how the coloring of the Scrub-Jay helps it to disappear in into a busy, broken background. From my limited experience it does appear that Scrub Jays spend more time in smaller bushes than the Steller's Jays or Crows which I watch around Union Bay.

They also spend time in the tree tops. Against a clear blue sky a Scrub Jay certainly looks elegant. I was surprised to notice that the tail feathers which are blue on the topside are grey underneath.

The feathers of the wings are also blue on the upper surface. In this case as well, the undersides of the feathers seem to grow a darker grey as the distance from the body increases.


All birds can get in surprisingly awkward positions while preening their feathers. 

The miracle of flight requires minimal air resistance which is in part achieved with well groomed and aligned feathers.

I am sure clean feathers are also lighter which helps to increase a bird's endurance and range.

I am at a loss to explain why we still call such a beautiful bird a Scrub-Jay.

In my experience the term scrub is a derogatory term. In the sawmill towns where I grew up scrub was used to describe bushes which were considered too small to harvest for lumber and which were therefore consider worthless. In fact small bushes are actually a critical habitat for birds and other wild creatures. Along a similar line, in sports the term scrub is used to describe strike-breaking substitutes which are considered to be worth less than the more skilled athletes which they temporarily replace.

Currently, the Scrub-Jay species found in California, Oregon and Washington is called the California Scrub-Jay. It is one of four species which previously were combined into a single group called the Western Scrub-Jay. Even though this bird often spends time in smaller shrubs and undergrowth I believe it has other attributes which deserve to be highlighted via its name. 

For example, California Scrub-Jays can also be found in oak woodlands. (Woodlands which are in need of protection. Click Here for more information.) In this habitat they utilize their incredible memory to distribute, store and retrieve acorns from a wide variety of locations. Without this amazing capacity these birds would be unable to survive the winter. Certainly, a name reflecting this mental acuity around oaks and acorns would more properly reflect their skills and abilities.

If I was lucky enough to name this bird I might call it the 'Blue-Grey Acorn Jay".

Have a great day on Union Bay...where nature lives in the city!

Larry

Going Native:

Without a well-funded Environmental Protection Agency, it falls to each of us to be ever more vigilant in protecting our local environments. Native plants and trees encourage the largest diversity of lifeforms because of their long intertwined history with our local environment and native creatures. I have been told that even the microbes in the soil are native to each local landscape. My hope is that we can inspire ourselves, our neighbors and local businesses to respect native flora and to support native wildlife at every opportunity. I have learned that our most logical approach to native trees and plants (in order of priority) should be to:

1) Learn and leave established native flora undisturbed.
2) Remove invasive species and then wait to see if native plants begin to grow without assistance. (If natives plants start on their own, then these plants or trees are likely the most appropriate flora for the habitat.)
3) Scatter seeds from nearby native plants in a similar habitat.
4) If you feel you must add a new plant then select a native plant while considering how the plant fits with the specific habitat and understanding the plant's logical place in the normal succession of native plants.

My intention in my weekly post is to include at least one photo each week and visually challenge us to know the difference between native and non-native lifeforms.


This week I am taking a slightly different approach. My friend and photographic mentor, Laurence Norton, sent me a link from King County which suggests native replacements for English Ivy. I hope you find This Link as interesting (and useful) as I did!




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The Email Challenge:

Over the years I have had many readers tell me that Google is no longer sending them email announcements regarding my posts. Even more frustrating when they go to 're-sign-up', hoping that will enable them to once again start receiving the announcements, they get a message which says 'Sorry, you are already signed up.' Google has not responded to my requests for help with this issue. 

My functional work around is to setup my own email list and each week I manually send out a new post announcement. If you are experiencing the issue and would like to be added to my personal email list please send me an email requesting to be added. Thank you for your patience!


My email address is LDHubbell@comcast.net




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5 comments:

  1. I had no idea that the scrub-jay would ever appear in Seattle -- I will be looking out for them now! Thanks, Larry.

    ReplyDelete
    Replies
    1. John,

      Thank you! That sounds very interesting. I will definitely check it out!!

      Larry

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    2. Valerie,

      Thank you and Good Luck with the Scrub Jays.

      Larry

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  2. Hi, Larry! I suspect that names like scrub jay derive from the birds' habitat, scrub being a common and non-derogatory term for a dry, brushy landscape. As for the blue colors in jays' feathers, I can recommend this fine article: https://academy.allaboutbirds.org/how-birds-make-colorful-feathers/. It deals both with pigmentation and with structural colors like those in jay feathers. It even suggests a simpler experiment than crushing a feather - just shine light through the feather, rather than onto its surface, and see what happens! They give you a good explanation of the outcome.

    ReplyDelete
    Replies
    1. John,

      Thank you!! That sounds extremely interesting! I will check it out.

      Larry

      Delete