Rocs were gargantuan avians with feathers that were normally either dark brown or golden in color, though rare black, red, or white rocs were sometimes reported. From the head to the base of the tail, rocs could grow as long as 60 ft, with wingspans up to a staggering 120 ft in length. Weighing up to 8000 pounds, rocs hunted, and attacked, by swooping down from the sky with talons outstretched to snatch and carry off prey. A single roc would be hunting, and therefore willing to try and take any suitably sized creature, but a pair of rocs would act in concert and fight to the death to defend the nest and eggs or hatchlings.
A roc's hunting radius was usually around 10 miles, and they were known to carry off very large prey, including Horses, Cattle, and even Elephants. They typically lived in warmer mountainous regions, and dwelled far apart from each to avoid straining the supply of prey unless mated. Their lairs were a vast nest of trees and large branches, with shiny treasure strewn about as the creatures did not place any value upon it.
Roc eggs were green and spotted, and generally several times larger than an average Humanoid. They were considered a nearly deific by many cultures across many planes.