Purple martins are indigenous to Cahokia Mounds. This illustration shows how Native Americans might have housed them in gourds.
Purple martins are indigenous to Cahokia Mounds. This illustration shows how Native Americans might have housed them in gourds. Cahokia Mounds State Historic Site
Purple martins are indigenous to Cahokia Mounds. This illustration shows how Native Americans might have housed them in gourds. Cahokia Mounds State Historic Site