"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.
there are other people out there - singing the same melodies of wanderlust, climbing over mountains in the dark, and waking in the night to stare at the moon, thinking of this large world and dreaming - just like you." I Apex Curve