"Shifting Spring Weather Is Messing With Birds' Delicate Clocks"

"Timing is everything for migratory songbirds chirping away in North America's trees.

If they arrive too late, they'll get only the scraps of spring's insect buffet. Plus, the best nesting spots and mates will be taken, leaving them with lackluster prospects for making baby birds. Arrive too early, and they'll face a hostile winter chill.

Yet climate change is making it harder for birds to get it right. Spring is arriving earlier in the eastern states and later in the west, disrupting the timing of dozens of songbird species, a new study found."

Maria Gallucci reports for Mashable May 16, 2017.