It's spring where Jessi and Squeaks lives, and that means the air is filled with the sounds of birds singing! But have you ever wondered why birds sing and who they're signing to? ---------- Love SciShow Kids and want to help support it? Become a patron on Patreon: https://www.patreon.com/scishowkids ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow SOURCES: Ackerman, Jennifer. The Genius of Birds. http://sites.biology.duke.edu/nowicki/papers/NS04anyas.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3377815/ https://academic.oup.com/beheco/article/20/1/200/215231/The-deterrent-effect-of-bird-song-in-territory http://www.bioone.org/doi/abs/10.2326/osj.5.5 https://www.allaboutbirds.org/guide/Northern_Cardinal/lifehistory http://bioweb.biology.utah.edu/yamaguchi/PDF/Yamaguchi%201998%20Condor%20sex%20dim%20learned%20bird