(1.) Heb. sis (Isa. 38:14; Jer. 8:7), the Arabic for the swift, which “is a regular migrant, returning in myriads every spring, and so suddenly that while one day not a swift can be seen in the country, on the next they have overspread the whole land, and fill the air with their shrill cry.” The swift (cypselus) is ordinarily classed with the swallow, which it resembles in its flight, habits, and migration.

(2.) Heb. deror, i.e., “the bird of freedom” (Ps. 84:3; Prov. 26:2), properly rendered swallow, distinguished for its swiftness of flight, its love of freedom, and the impossibility of retaining it in captivity. In Isa. 38:14 and Jer. 8:7 the word thus rendered (‘augr) properly means “crane” (as in the R.V.).

Heb. deror in (Psalms 84:3; Proverbs 26:2) Heb. ’agur in (Isaiah 38:14; Jeremiah 8:7) but “crane” is more probably the true signification of ’agur [Crane]). The rendering of the Authorized Version for deror seems correct. The characters ascribed in the passages where the names occur are strictly applicable to the swallow, viz., its swiftness of flight, its meeting in the buildings of the temple, its mournful, garrulous note, and its regular migrations, shared indeed in common with several others. Many species of swallow occur in Palestine. All those common in England are found.