April 5, 2019 – The soft songs of the American Tree Sparrow are like a pleasant melodic whispering that easily causes one to momentarily pause and focus. This medium size sparrow can be seen at times singing from a low perch on a bush or while foraging on the ground at the edge of a thicket. Winter flocks of these little rusty capped birds have been gathering, feeding, and building energy while waiting for that moment during their spring migration when they take their night flight north towards the Arctic tundra of Canada and Alaska.
As days begin to grow longer metabolic changes occur that help prepare the birds for their long flight. According to the Cornell Lab of Ornithology, a huge increase in appetite helps to build up fat reserves that are required for such a physically demanding journey. Both internal and external factors play a role that triggers the big push north for the nesting season. Weather conditions are important so as to coincide with insect hatching in the stopping areas along the migratory route.
One can only imagine what it would be like to be part of a flock of a few hundred small birds on a cool, crisp starry night flying towards that shimmering fiery glow of the auroras above the northern latitudes. Those little sparrows face many miles and a number of challenges as they work very hard to reach their nesting grounds north of the tree line where the Arctic fox, the polar bear, and the ptarmigan call home.