Ancient Puebloans inhabited Arizona's largest cliff-dwelling
site for 50 years, and then deserted it.
Restricting the use of bolts, NPCA and others have argued, would reduce litter, protect cliff-dwelling
plants and wildlife, leave rock faces free of drilling damage, and limit markings from the chalk climbers use for a better grip.
Although he has not dated samples of the cliff-dwelling
trees, he notes that they appear very similar in form to the cedars on the Niagara Escarpment.
Biologists have discovered that adult cliff-dwelling
swallows sometimes carry one of their own eggs into the nest of an unwitting neighboring swallow, and then fly away minus the egg -- a sneaky maneuver called reproductive parasitism that may increase the chance of the egg's survival.
Ray, an uneducated man who had run away from home as a boy and had been to Mexico and the American Southwest, stirs Thea's imagination with his stories about cliff-dwellings
, burial mounds with caches of pottery and feather blankets, and a completely preserved corpse of a woman wearing a string of turquoise around her neck.