North America Research South America Species 
10,000 Birds
JUNE 1, 2021
Pough “with illustrations in color of every species” by Don Eckelberry, Doubleday, 1946. And now we have the third iteration in Audubon’s guide book history: National Audubon Society Birds of North America. The press material says it covers over 800 species, so you know I had to do a count.
10,000 Birds
MARCH 21, 2015
These and several other species might end up being armchair ticks if and when we take a closer look at their evolutionary history. Taxa that could end up being split into one species occurring north of the Isthmus of Tehuantepec, and one south of the isthmus. (2). Bird species that require further research.
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10,000 Birds
JANUARY 25, 2015
A new paper out this month attempts to paint the most comprehensive picture yet of the origins and diversification of the American sparrows, wood-warblers, blackbirds, cardinals, tanagers, and their kin, an enormous group of birds more than 800 species strong. The paper is by leading researchers F. Keith Barker, Kevin J.
10,000 Birds
OCTOBER 8, 2020
Guiding aside, Howell is a research associate at the California Academy of Sciences and the author of many books, including Petrels, Albatrosses, and Storm-Petrels of North America (Princeton). We have tended to a liberal (= realistic) direction when recognising species.” Well, this is one interesting claim.
10,000 Birds
DECEMBER 18, 2014
Fish and Wildlife Service has listed the “Rufa” population of Red Knot ( Calidris canutus rufa ) as a threatened species under the Endangered Species Act (ESA). The other sub-species, Calidris canutus roselaari , migrates along the Pacific Coast and breeds in Alaska and the Wrangel Island in Russia.
10,000 Birds
AUGUST 18, 2021
All sorts of exotic and beautiful species may be seen. This would sound attractive even to me, except for one fact: almost all of those exotic and beautiful species are common down here in central Mexico. Southeastern Arizona is unusual, precisely because its species mix is as much Mexican as it is American.
10,000 Birds
FEBRUARY 17, 2015
If this was America, we might not be concerned because starlings are an invasive species, at least in North America. Researchers are wondering if the die-off might spread to other birds or even fish. This is not something I needed to tell you but there is some new research.
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