Nature Notes From Crater Lake - Volume 13, October 1947
Crater Lake Institute online library - www.craterlakeinstitute.com
On June 7, a female Forster's tern, Sterna forsteri, was found dead near the Lost Creek Ranger Station at the East Entrance to the park. It was evidently a casualty of the storms of the first week of June. Forster's terns have not previously been reported within Crater Lake National Park; this specimen can only be regarded as accidental.
Post mortem examination revealed that she had not eaten for some time as no sign of undigested food was found in the digestive tract. Since these birds are known to nest in the marshes of Upper Klamath Lake, it is probable that this bird was lost in the storm and was unable to find suitable food in the unsuitable habitats afforded by the rugged southern Cascades of which Crater Lake National Park is a part. This tern is a marsh loving bird which is not conditioned to timbered areas.