Bluebird fans helped scientists collect invasive house sparrow eggs, revealing higher-than-expected heavy metal levels from ...

The house sparrow is a highly invasive pest in North Carolina, and bluebird enthusiasts frequently throw their eggs out and remove their nests to keep them from overtaking the nestboxes that bluebirds ...

This shows song sparrow eggs: Zanette et al. report that just hearing the calls and sounds of predators frightened mother songbirds so much that they laid fewer eggs. Eggs were numbered in the order ...

In early March, birds that have been gone all winter begin appearing at my feeder. One of the earliest of these spring ...