In a 2011 study, scientists declared that tortoises living north and west of the Colorado River — the Mojave population now called Agassiz's desert tortoises, or Gopherus agassizii — are officially a ...

The curve-billed thrasher—the common thrasher of the rich, cactus-laden Sonoran Desert—can be very conspicuous ... Adults distinctive; note different habitat and calls compared with the ...