Edit this Published in Freakonomics Radio Which Came First, the Chicken or the Avocado? Listen 29 min Queue Download this audio Want to embed this player? Use the code below. More info. <iframe frameborder="0" scrolling="no" height="130" width="100%" src="https://www.wnyc.org/widgets/ondemand_player/wnyc/#file=/audio/json/366018/&share=1"></iframe> Share on Facebook Share on Twitter Email a Friend When it comes to exercising outrage, people tend to be very selective. Could it be that humans are our least favorite animal?