National Geographic Research, Volume 2

activity adult American analysis animals appear associated authors behavior birds building buttes called Cave central changes chiefs collected compared complex continuation core Department deposits display distribution early eastern Ecology editors effect evidence excavations females field Figure forest fossil four groups habitat History indicate individuals Institute island Journal king known land Late less limited located lower males mammals mean Michigan Middle Museum National Geographic Natural observed occur organic Panama pattern period plants Pleistocene populations present Press probably pupae Qinghai range recharge recorded region relatively remains reported represent Research roost samples sapropel Science side similar social Society soil South southern species specimens structure suggest surface survey Table temperature tion units University upper urban wall Washington zone