"We may all be netted together" - Darwin. This picture is a great way to illustrate and explain the relations/interactions within all animals. Does not necessarily relate to sexual selection, but a good representation of all Darwin theorized of.
My Badass Notebook: 105 Lined Pages, Large Size Book 8 1/2" x 11"
JayBird F5 Freedom Wireless Bluetooth Sports Headphones with Charging Pack