G-39 Alaplı Stream, one of the perennial streams of Zonguldak, has a rich bird diversity. The approximately 28 km long Alaplı river starts from Bölüklü plateau where Jeosit G-35 is located. The lower part of the streams, about 4 km low, forms a wetland for migratory and non-migratory birds. Habitat types also vary at different altitudes from the starting point of the stream to the ending point. This diversity also supports a diverse avian fauna along the river. Along the creek, there are living and breeding areas of Marstit, Blackkap, Hawfinch songbirds. The flow system also supports gulls, cormorants, divers and ducks. The Akgerdanlı Dipper is a characteristic bird that lives along the river. During the migration seasons, shorebirds can also be found along the stream.