Palo Verde National Park was declared a wildlife refuge during the 1970s because over 60 species of birds used the laguna, or wetland, as a migratory stop. There were once 35,000 black bellied whistling ducks, 25,000 blue winged teal, and several hundred migrating ducks during the dry season.
Palo Verde National Park was designated a wildlife refuge in the 1970s due to over 60 bird species utilizing the lagoon as a migratory stopover point. The park once hosted 35,000 black-bellied whistling ducks, 25,000 blue-winged teal, and numerous migrating ducks during the dry season.