Their origin story says that the Yaquina, Alsea, Yachats, Lower Umpqua, and Siuslaw people are all one tribe, and speak the same language.
The Alsean people (Yaquina/Alsea/Yachats) all practiced forehead flattening (by slight pressure applied in baby’s cradleboard) until about 1860.
The Confederated Tribes of Siletz Indians, represented Tillamook, Yaquina, Alsea, Coquille, Tututni, Chetco aboriginal title compensation claims in the 1940s–50s.
"[2] The Alsea hunted seals and sea lions, fished for salmon, and gathered camas roots.
[3] The Alsea wore robes of seal skin, wove baskets and made grass raincoats.