Mass Die-Off of Birds in Southwest US 'Probably Linked to Climate Crisis'

The Guardian reports: The mass die-off of thousands of songbirds in south-western U.S. was caused by long-term starvation, made worse by unseasonably cold weather probably linked to the climate crisis, scientists have said. Flycatchers, swallows and warblers were among the migratory birds "falling out of the sky" in September, with carcasses found in New Mexico, Colorado, Texas, Arizona and Nebraska. A USGS National Wildlife Health Center necropsy has found 80% of specimens showed typical signs of starvation... The remaining 20% were not in good enough condition to carry out proper tests. Nearly 10,000 dead birds were reported to the wildlife mortality database by citizens, and previous estimates suggest hundreds of thousands may have died... "It looks like the immediate cause of death in these birds was emaciation as a result of starvation," said Jonathan Sleeman, director of the USGS National Wildlife Health Center in Madison, Wisconsin, which received 170 bird carcasses and did necropsies on 40 of them. "It's really hard to attribute direct causation, but given the close correlation of the weather event with the death of these birds, we think that either the weather event forced these birds to migrate prior to being ready, or maybe impacted their access to food sources during their migration...." Most deaths happened around 9 and 10 September during a bout of cold weather that probably meant food was particularly scarce...

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