sonoran desert toads http://www.desertmuseum.org/books/nhsd_desert_toad.php Arizona-Sonora Desert Museum: Sonoran Desert Toad http://www.desertmuseum.org/books/nhsd_desert_toad.php Arizona-Sonora Desert Museum http://www.desertmuseum.org/books/nhsd_desert_toad.php greenish-grey guys are the giants of the toad world ”Bufo alvarius - Sonoran Desert Toad” SONORAN DESERT TOAD Sonoran Desert toad