Addendum to the Bird Song Key to the Birds of Pipeline Road Area, Soberanía National Park, Panama: Two Additional Wrens

Identifying species of birds by their songs is an important part of censusing, watching, and enjoying birds. However, differentiating among scores or hundreds of bird songs in an area can be difficult. Placing songs into a descriptive key can help in this endeavor by requiring the user to analyze each song and to identify similarities and differences among songs. In 2016, I published a bird song key to the Pipeline Road area in and adjacent to Soberanía National Park, Panama, which included 321 songs of 216 species. This key is, to my knowledge, the largest bird song key in the world. Since the key was published, two species—Rufous-breasted Wren (Pheugopedius rutilus) and Rufous-and-white Wren (Thryophilus rufalbus)—have moved into the area. This addendum adds three songs of Rufous-breasted Wren and three songs Rufous-and-white Wren to the key, thereby increasing the key’s song total to 327 and its species total to 218.