Our photo of the week was taken by Paul Watson, a Pulitzer Prize winning journalist who had a long and storied career as a war correspondent before he started covering the circumpolar Arctic. It shows two muskoxen about 150 km east of Iqaluktuuttiaq (Cambridge Bay), Nunavut. The muskox is an ice age survivor that was nearly extinct at the beginning of the 20th century, but they have since repopulated much of the Canadian Arctic. However in recent years their numbers have dropped, and hunters have reported finding groups of dead muskoxen. According to University of Calgary research veterinarian Susan Kutz, several factors are affecting their health, including a lungworm that has spread from the mainland to Victoria Island. Its spread is likely attributable to warmer temperatures that have allowed the slugs and snails that host the lungworm to thrive.