How climate change is affecting bird migration
Bird migration is getting thrown off by climate change, with many birds arriving late or taking new routes because of shifting temperatures and rainfall.
This messes up their food supply along the way, especially for long-distance travelers; for example, American Robins have shifted arrival timing by up to 20 days in some analyzes.
What's the main problem?
One reason is that, for some species, birds are leaving their southern wintering grounds later, rather than flying slower.
Many species are feeling this timing mismatch.
Plus, changing tropical weather—like drier Caribbean winters—is making life harder for songbirds such as American Redstarts.
What does this mean for birds?
Fewer safe stopover spots and weaker arrivals mean some birds struggle to survive their journeys.
These timing shifts are also breaking up long-standing bird communities at key migration sites, which matters because these birds help keep ecosystems healthy by spreading seeds and controlling pests.