Insect pests; other animal pests
Adelgids, weevils, inchworms and budworms[a], wasp and fly larvae; bears, elk, grouse and squirrels[1][2][3][4]
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- ^ Crawford & Oliver 1991, pp. 22, 23.
- ^ Frank 1991, pp. 26–34.
- ^ Foiles, Graham & Olson, Jr. 1991, pp. 52–58.
- ^ Alexander, Shearer & Shepperd 1991, pp. 60–68.