Birds ‘falling out of the sky’ in mass die-off in south-western US

Weather events in the southwestern states of the US including dry conditions, wildfires and a cold snap may have all had devastating effects on thousands of migrating birds including flycatchers, swallows and warblers.  For the past few weeks, these species have been literally “falling out of the sky” as part of a mass die-off across New Mexico, Colorado, Texas, Arizona and farther north into Nebraska, with growing concerns there could be hundreds of thousands dead already. Experts say the carcasses have little remaining fat reserves or muscle mass, with some appearing to have nose-dived into the ground mid-flight.