Common Loon Citizen Science Project

loon with chick

Glacier National Park is estimated to harbor approximately 20% of Montana's breeding population of Common Loons.


Common Loons are a Montana Species of Special Concern. A glimpse of Glacier's loon population gathered from Montana Loon Day, an annual statewide survey event that Glacier joined in 1988, raised concern about the sustainability of Glacier National Park's population. This baseline data set indicated that Glacier harbors approximately 20% of Montana's breeding common loons, yet only five to six loon chicks are produced on average each year within the park.

In 2005, the Common Loon Citizen Science Project was developed to increase our understanding of Glacier's loon population beyond this annual snapshot, and to improve the accuracy of observations and reliability of the information.

During an all-day training, CCRLC staff members instruct citizen scientists on species identification and survey methods for the Common Loon Project. Once trained, citizen scientists are able to venture into Glacier's backcountry and observe loons during a one-hour survey. We ask that participants try to conduct at least three surveys during the field season (on their own time), choosing survey sites based on personal hiking ability and preference. The data gathered provides baseline information on population size and reproductive success at 45 lakes throughout the park.

Loons are susceptible to adverse impacts by human disturbance at nest and nursery sites. Loon surveys also help identify factors that affect nesting success. The contribution of citizen scientists to the long-term record of loon population health is invaluable in providing a scientific basis for management recommendations, especially in regards to issues that may affect loon nesting success and habitat.

To learn more about the Common Loon Citizen Science Program, you can download the education presentation below, or view a video about the program.

Common Loon Citizen Science Education Presentation (PDF, 3.7MB)

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