In migratory species. the timing of arrival at the breeding grounds is a life-history trait with major fitness consequences. The optimal arrival date varies from year-to-year. and animals use cues to adjust their arrival dates to match this annual variation. https://www.roneverhart.com/2004-BMW-325i-Front-Engine-Hood-Hinge-w-Strut-Shock-Driver-Left-LH-OEM/