10,000 Birds

MARCH 30, 2015

(That impressive number is a testament to the exponential advances in DNA-sequencing technology, but the researchers are quick to note it’s still less than 1% of the total genome.). They found no DNA variation that distinguishes Hoary Redpolls from Common Redpolls.

Species 213

Species Switzerland Groups Europe 213

10,000 Birds

MAY 10, 2015

You see, it clearly resembles a hybrid between the Spanish and the House Sparrow, and an ancient hybrid event was long suspected to be the source of its existence – with recent research indicating that apparently this isn’t the case after all.

Sparrows 216

Sparrows Italy Asia Austria 216

10,000 Birds

MARCH 3, 2020

The source of this ranking, BirdLife International, lists Bolivia as currently having 1,439 bird species, including 18 breeding endemics. Like most maps, colors are used to indicate seasonal status (breeding resident, Austral migrant/visitor, Boreal migrant, etc.). Distribution maps are also different from other field guides.

Bolivia 173

Bolivia Birds Brazil Switzerland 173

10,000 Birds

FEBRUARY 5, 2012

We now know a lot more, and the following information is largely based on the excellent work of our local bird data compiler Armin Konrad , who was amongst the first to notice the die-off in the first place and was also instrumental in coordinating the surveys and research that finally led to the identification of the culprit!

Germany 160

Germany Blackbirds 2006 Denmark 160