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クロシロエリマキキツネザル

World’s most dangerous bird has bizarre, glowing headgear

Structures on cassowaries’ skulls fluoresce under UV light, hinting at a hidden visual signal

Often labeled “the world’s most dangerous birds,” cassowaries just got even more intriguing. The aggressive, flightless birds have structures on top of their heads called casques, the purpose of which has long confused scientists. To the human eye, casques look fairly plain—but new research published last month in Scientific Reports finds this headgear fluoresces under ultraviolet (UV) light, possibly aiding the birds’ visual displays...

Saxicola torquata [ノビタキ,Siberian Stonechat]

Terpsiphone atrocaudata [サンコウチョウ,Japanese Paradise Flycatcher]

Acrocephalus arundinaceus [オオヨシキリ,Great reed warbler]

Brown Jay (Cyanocorax morio), subadult, family Corvidae, order Passeriformes, Rio Grande Valley of South TX, USA

Green Jay (Cyanocorax luxuosus), family Corvidae, order Passeriformes, South TX, USA

Golden-cheeked Warbler (Setophaga chrysoparia), male, family Parulidae, order Passeriformes, Central TX, USA

ENDANGERED.

Endangered due to destruction of habitat and increase in nest predation by (native) Brown-headed Cowbirds.

The only bird that nests exclusively in the state of Texas.