A global study of the wide variation among birds in this trait, known as the "clutch size," now provides biologists with some answers. The study, published in the current issue of the journal PLoS Biology, combined data on the clutch sizes of 5,290 species of birds with information on the biology and environment of each of these species.
Why do some bird species lay only 1 egg? UC San Diego study offers some answers
- 8. 12 2008 (06:00)