Agar. Agar or agar-agar is a gelatinous substance derived by boiling a polysaccharide in red algae, where it accumulates in the cell walls of agarophyte and serves as the primary structural support for the algae's cell walls.gar. Agar or agar-agar is a gelatinous substance derived by boiling a polysaccharide in red algae, where it accumulates in the cell walls of agarophyte and serves as the primary structural support for the algae's cell walls.
Photo by Lisa Powers. Description: Typical timber rattlesnakes measure anywhere from 36-58 inches (91-147 cm) in length with Klauber (1956) reporting the largest timber rattlesnake ever recorded to be 74  inches (189.23 cm) collected near New Orleans, LA in the 1940s. Timber rattlesnakes are the 2nd largest venomous snake found in the eastern United States.
The snake in the picture is an Eastern Diamondback Rattlesnake, Crotalus adamanteus. This is apparent because of the black and gold diamond-patterning and, of course, the rattle. This species does not reach eight and a half feet long. That would be the world's largest rattlesnake ever known to science. I don't believe this is the world's largest rattlesnake ever known because it is clearly an animal that is approximately half that size and thrust toward the camera on a long piece of wood. It's a rattlesnake camera trick I explain several times here.