http://www.cracked.com/article_15926_the-15-most-bizarre-animal-mating-rituals.html
http://whatculture.com/science/10-ridiculously-weird-animal-mating-rituals
http://aplus.com/a/12-weird-mating-rituals?no_monetization=true
https://en.wikipedia.org/wiki/Bowerbird
http://oregonstate.edu/ua/ncs/archives/2012/feb/power-estrogen-%E2%80%93-male-snakes-attract-other-males
https://www.ncbi.nlm.nih.gov/pubmed/4006433
https://en.wikipedia.org/wiki/Penis_fencing
https://en.wikipedia.org/wiki/Hippopotamus#cite_ref-The_Hippos_12-1
https://www.thoughtco.com/sexual-suicide-by-honey-bees-1968100
http://news.nationalgeographic.com/news/2001/04/0423_mandarinfish_2.html
https://en.wikipedia.org/wiki/Bonobo
http://www.thecephalopodpage.org/Argo.php