Jeremiah 8:7

Jeremiah appeals to the obedience which migratory birds render to the law of their natures. The “stork” arrives in Palestine about March 21, and after a six weeks’ halt departs for the north of Europe. It takes its flight by day, at a vast height in the air (“in the heaven”). The appearance of the “turtle-dove” is one of the pleasant signs of the approach of spring.

The crane and the swallow - Rather, “the swift and the crane.”