Diamond-backed Watersnake

Nerodia rhombifer

Diamond-backed Watersnake from Val Verde County, Texas

subadult Diamondback Water Snake

Diamond-backed Watersnake from Colorado County, Texas.

Diamondback Water Snakes, Gillespie County, Texas

Diamond-backed Watersnakes from Gillespie County, Texas.

The above photograph shows two males courting a larger female.  When first approached for this photo, there were seven males courting the female.
Often, larger numbers of males are found courting a single female, giving rise to the stories of "nests of water moccasins".   These snakes are neither venomous, nor aggressive, and will generally flee at the slightest disturbance.