Here’s a rat snake (genus Elaphe) climbing a brick wall in Florida, using the mortar to help it along.
As Greg Mayer commented when seeing the video,”Great stuff! Rat snakes are arboreal, and the ventrolateral edges of their body are at right angles (like a slice of bread), which lets them catch on to and grab hold of irregularities with their sides.
I’ve attached a picture showing the body shape from Conant, R. & J.T. Collins. 1998. A Field Guide to Reptiles and Amphibians of Eastern and Central North America. 3rd ed., expanded. Houghton Mifflin, Boston .”
Greg adds, “Also, note that the people in the video think the snake may be going after a lizard on the shutter; given the size of the snake, I think this is not likely (young rat snakes eat lizards, adults not so much). The lizard is probably an anole, but it is seen too briefly and from too far away to tell for sure.”
h/t: Matthew Cobb for the video