It's an odd quirk of nature that birds - even chickens - typically lay just one egg a day, and many species rely on all the eggs in the clutch hatching on the same day.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/climate-change-will-remove-birds-control-over-hatching-eggs-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/age-australia
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-impacts
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birds
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/australia