For anyone interested in learning more about the awesome colors of birds, 
check out this book.  It's written for a layperson, but explains some of the 
science and biology underlying the variation in bird coloration.
https://www.amazon.com/National-Geographic-Bird-Coloration-Geoffrey/dp/1426205716/ref=asc_df_1426205716/?tag=hyprod-20&linkCode=df0&hvadid=312064598816&hvpos=1o1&hvnetw=g&hvrand=12039168791264878923&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9005639&hvtargid=pla-538323650879&psc=1

Enjoy!
Cheers,
Mark DeutschlanderDept. of BiologyHobart and William Smith Colleges
    On Sunday, July 21, 2019, 11:35:59 AM EDT, Donna Lee Scott 
<d...@cornell.edu> wrote:  
 
  Was a treat just now to watch different sizes & colors of birds at porch 
suet, nyjer, sunflower, seed mix, sugarwater, & grape jelly feeders- & hear a 
Scarlet Tanager singing across road in woods:A. GoldfinchesPileated Woodpecker 
femaleDowny Woodpecker femaleBlue Jays w/ babyB Oriole maleRed-winged Blackbird 
maleRT HummingbirdMourning DoveCarolina Wren scolding!

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