It was still chilly enough for the volunteers to wear fleeces as they followed the trail along a small creek that burbled in the shade of the canyon’s craggy walls. The trailhead was 30 miles west of Nogales, about 10 miles north of the border and far from the nearest ranger station. At times, the only sounds came from the creek, the breeze rustling the oaks and the chirps of the yellow warbler and cactus wren, Arizona’s state bird.

Source: Los Angeles Times March 11, 2019 11:03 UTC