Sentinels of the Desert by Laura RussellSaguaro cactus, majestic symbol of the Sonoran Desert, are endangered by climate change, drought and competing invasive plant species. Their only native habitat is this arid, mountainous desert and they form the foundation of an interdependent ecosystem that would be forever lost if conditions continue to decline. To the Tohono Oodham, who have lived in the Sonoran Desert for thousands of years, the Saguaro is an integral part of their culture,