Palo Verde National Park was declared a Wildlife Refuge during the 1970s; over 60 different species of birds used the Laguna, or wetland, as a migratory stop. However, the introduction of Typha domingensis (southern cattail) has interfered with bird migration.
Palo Verde National Park was designated a Wildlife Refuge during the 1970s; various bird species, exceeding 60 in number, employed the Laguna wetland as a transitional point during their migrations. However, the introduction of Typha domingensis (southern cattail) has impeded bird migration.