25 days earlier: global warming makes birds nest sooner
Climate Change Environment Wildlife

25 days earlier: global warming makes birds nest sooner

Dr. Lindy Whitehouse
Dr. Lindy Whitehouse

In 10 seconds? A century-old collection of birds’ eggs has helped scientists determine that birds are nesting earlier than they used to a hundred years ago. The reason? Climate change.

What’s the breakthrough? Researchers have found that a third of the bird species found in Chicago are nesting and laying their eggs a month earlier than they were a hundred years ago. The scientists compared recent observations with eggs from museum collections and determined that birds are laying their eggs 25 days earlier on average. The researchers then examined carbon dioxide records to estimate changes in temperatures in the region over the last century and found that the estimated increases in carbon dioxide, and hence temperature, correlated with the earlier egg-laying, suggesting climate change is the cause.


Get unlimited access to our 3-min Digests and other premium features

Choose your plan:

Personal

$99/year

✅ Includes 7-day free trial for new users
✅ Weekly Recap
✅ Daily newsletter
✅ Access 4 topic areas of your choosing
✅ Access all citations and resources
✅ Gain background knowledge with a Quick Dive
✅ The Sparrow Sessions Podcast
✅ No ads
❌ Direct access to the Expert Network
❌ Your questions - answered by an Expert Scientist
❌ 12 hours of consultations with our fabulous experts per year (that’s 1 hour per month!)
❌ Access to all topic areas as we scale the Content Library

We'll send you a reminder email 3 days before your trial ends.

Start my free trial

Professional

$3499/year

✅ Includes 7-day free trial for new users
✅ Weekly Recap
✅ Daily newsletter
✅ Access all citations and resources
✅ Gain background knowledge with a Quick Dive
✅ The Sparrow Sessions Podcast
✅ No ads
✅ Direct access to the Expert Network
✅ Your questions - answered by an Expert Scientist
✅ 12 hours of consultations with our fabulous experts per year (that’s 1 hour per month!)
✅ Access to all topic areas as we scale the Content Library

We'll send you a reminder email 3 days before your trial ends.

Start my free trial