In fact, the Creator himself said: “The stork in the sky knows its seasons; the turtledove and the swift and the thrush keep to the time of their return. ” ​ — Jeremiah 8: 7.
Piiblis on Looja sõnad: „Toonekurg taeva all teab oma seatud aega, turteltuvi, pääsuke ja rästas panevad tähele oma tulemisaega ”.