1. deror. This is interpreted 'roving about,' which agrees well with the habits of the swallow or swift. They come and go, and are not domesticated. Proverbs 26:2 . In Psalm 84:3 it is typical of the wanderer finding rest and protection in God's house.
2. agur, mentioned with the word sis, translated 'crane' and 'swallow;' but sis doubtless refers to the swallow, and agur to the crane. The swallow (or perhaps the swift) is mentioned as 'chattering,' or having a 'garrulous note,' and it is migratory. Isaiah 38:14; Jeremiah 8:7 . Several species of the swallow frequent Palestine: the Hirundo rustica, H. rufula, etc. A species of swift finds the Jordan valley warm enough in the winter, and need not migrate.