Why do porcupines have antibiotics on their quills? Is urination romantic? Can porcupines throw their quills? Find out the answer to all these questions and more on this episode of Species. Bibliography: https://docs.google.com/document/d/1jk-CCUSRdr-pzdIRmmpnCfdMezkY5SuIPXVcvR45yFA/edit?usp=sharing   Here is the affiliate link for my new audio course, "Human Evolution," first episode is free: https://frstre.com/go/?a=95595-7e38d9&s=1771291-5cf1d5&p_affiliate.referral_code=mackenmurphy I get 30% of your subscription if you subscribe through this link, your support is greatly appreciated! Also, you get 30% off when you sign up online and use the promo code: mackenmurphy