The relative abundance of species is recorded as the number of individuals seen per hour spent in the field per observer. Each observer records the animal species encountered in the field and the number of individuals observed daily. To correct for any potential biases, the activities and the mode of transportation of observers is also taken into account. We also monitor the nests of bird species that are not part of our long-term monitoring and are found opportunistically, such as Arctic Tern, King Eider, Long-tailed Duck, Red-throated Loon, Pacific Loon, Rock Ptarmigan and Horned Lark.