An average Common Loon is about twice the body size of a Pacific Loon. Usually in our reservoirs, at this time of year, there are many Western Grebes and just based on body size alone they are about equal to a Pacific Loon. With just the right juxtaposition of a Common or Pacific Loon with a Western Grebe could also assist in a Common/Pacific Loon identification.
Bob Righter
Denver
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