In contrast to the sluggish reptiles and amphibians in the Triassic, we now have the fleet pronghorn (American Antelope); occasional coyotes and bobcats, porcupine, prairie dogs, rabbits, and many of the smaller rodents. Several species of harmless snakes and an occasional rattlesnake; slender, striped, long-tailed race runner lizards; scaled lizards, and the bright, green-backed, yellow-footed Bailey Collared Lizard which frequently brings visitors hurrying in to inquire if it is poisonous. It isn’t! Several species of birds such as the Desert Horned Larks and rock wrens make this their permanent home while many other species ranging in size from the tiny Allan Hummingbird to the mighty golden eagle either stay here during various parts of the year, or pass through in the spring and fall migrations. Intermixed with the surface deposits of petrified wood and other remnants of the ancient Triassic time are the much more recent remains of early men. Ruins of their homes, fragments of their handiwork, and examples of their arts are to be found in many locations. These people were pre-Columbian Pueblo Indians, ancestors of our modern Pueblo Indians, and of the same type that inhabited the other pueblo and cliff-dwelling sites in the Southwest. It is probable that there was considerable trading carried on between the people of this area and those at other locations, since many of the same pottery types are found throughout. This somewhat desolate region was apparently fairly densely populated by little groups of farming Indians. With no survey or study of the monument area having been made, more than 300 ruin sites have been located and there are many others nearby. These ruins of stone buildings are usually from one to a few rooms in size. However, one ruin near the Puerco River Ranger Station is estimated to have had about 125 or more rooms. It is built in the form of a hollow square about 180 feet by 230 feet, around a plaza about 130 by 185 feet. Probably two stories in height, it could have housed nearly a hundred families. A study of the pottery fragments from each site helps us to tell the approximate time that the particular site was occupied. This time varies from about 500 or 600 A.D. to 1400 A.D., some being used over a longer period than others. In most cases, the buildings were constructed of pieces of sandstone, but in a few instances the Indians had an eye for color and used pieces of petrified wood which made a very substantial as well as colorful building. “Agate House” in the south part of the Third Forest is one example of such construction. This was partially reconstructed in 1934 in the early Pueblo style by the use of chunks of petrified wood from the heap of the ruins. Indians also used the petrified wood for making arrow-points and other tools and weapons.