The large ones we see when a bird stretches its wings are “flight feathers,” but they also have fluffy ones called “down feathers.”
When winter comes, how can you tell if you're safe or on thin ice? Find out on today's Moment of Science.
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.