Changes in sunlight cause the cat’s brain to signal its hair follicles to respond appropriately. When there’s less sunlight, cats start growing short, fluffy secondary hairs whose job is to provide insulation. And when there’s more sunlight, cats start shedding.
First, it reduces ice formation within the mosquito’s cells, so that water hardens like glass but doesn’t form ice crystals that can then damage the cells.
During the current ice age glaciers have advanced and retreated over twenty times. We’re living during one of the warmer periods when the glaciers have retreated.
The large ones we see when a bird stretches its wings are “flight feathers,” but they also have fluffy ones called “down feathers.”