Have you seen an owl in your yard lately? Arctic Snowy Owls are moving south into the lower 48 states in numbers never before witnessed. A leading researcher has called the numbers "unbelievable." Most of the birds are younger owls, and it is believed that the migration is being caused by a fundamental failure of food supplies in the rapidly changing Arctic. The birds feed on lemmings and other small rodents.
They are known to engage in southerly migrations like this when prey is scarce, but the scale of what is happening now is completely unprecedented. It suggests that there has been a basic failure of the food chain in the high Arctic, probably due to Arctic melt..