The numbers of the Baltimore oriole, a songbird that does not eat budworms but is as dependent on South American coffee plantations as is the Tennessee warbler, are declining.

The spruce budworm population has dropped because of a disease that can infect budworms but not Tennessee warblers.

The drop in the population of the spruce budworm is expected to be only temporary.

Many Tennessee warblers have begun migrating in the fall to places other than traditional coffee plantations.

Although many North American songbirds have declined in numbers, no other species has experienced as great a decline as has the Tennessee warbler.