When two equally-matched diamondbacks both seek the attention of a lady, they will make a contest of each snake attempting to stand the tallest while trying to push over his opponent. Over and over again, they would stand as tall as snakily possible before yet again plummeting to the ground. We probably watched these antics for 15 minutes! Occasionally, the snakes ended up only 6 or so feet away, but were so obsessed with romance they never even acknowledged our presence. Finally, the unusual spectacle disappeared deep in the tall grass and we meandered along. Tucson, AZ.