European herring gull
Hou Røn is an island of 2 acres located 2 km south-east of Hou. The island first appeared in the 1930s, and has at times been entirely flooded or split into several islands. It grew together to form the current island over time, and is today covered in vegetation. The island is a breeding spot for many birds, including common eider, mallard, oystercatcher, great black-backed gull, European herring gull and red-breasted merganser. At one point rats had invaded the island, but they were removed from the island again by a local hunter. Hunting on the island is forbidden while birds are breeding.