In a world where biodiversity loss, invasive species, and habitat fragmentation continue to stress natural areas, it is more ...

The arid lands of the American Southwest are crisscrossed with lush ribbons of rivers, springs and wetlands supporting a rich diversity of aquatic and riparian species now facing an extinction crisis: ...

PHOENIX— Federal land managers have allowed years of extensive damage from livestock grazing to streamside habitats vital for ...

The San Pedro River travels north into Arizona from across the border in Mexico. It’s the last free-flowing river in the ...