SWALLOW
(a) Heb. «deror». It is interpreted as “wandering”, which is in accordance with its habits. They are migratory birds and are not domesticable (Prov. 26:2). In Ps. 84:3 he is a type of the wanderer who finds rest and protection in the house of God.
(b) “Sis”, Is. 38:14 and Jer. 8:7, where their habits are mentioned. There are several species of swallows that frequent the land of Israel: the “Hirundo rustica”, “H. rufula”, etc. One species of swift from the Jordan Valley has no need to migrate, due to its mild winter.