Why Do Birds Sing In The Morning?

You’re having a dream, and for some reason that giant rabbit that’s about to eat you starts to sing like a bird. You wake up to find that birds are singing outside your window! Check out this SciShow Quick Question to find out why those birds sing in the morning!

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Sources:
http://onlinelibrary.wiley.com/doi/10.1046/j.1474-919X.2003.00130.x/abstract
http://www.rspb.org.uk/makeahomeforwildlife/advice/expert/previous/morningsong.aspx
https://academy.allaboutbirds.org/birdsong/
http://ornithology.com/ornithology-lectures/songs-calls/
http://www.wired.com/2014/03/birds-sing-morning/
http://trib.com/features/science/scientists-discover-why-birds-sing-in-early-morning/article_0386ede4-e3aa-5be1-818b-39d220a10b1f.html
http://naturenetwi.blogspot.com/2013/05/why-do-birds-sing-in-early-mornings.html
http://blog.wbu.com/2013/03/04/why-do-birds-sing-so-early-in-the-morning/
http://news.leiden.edu/news-2014/female-birds-sing-much-more-often-than-previously-thought.html