Stomach-content analyses of pitfall-trapped amphibians and small mammals showed that the eastern American toad, Bujo americanus americanus, and the wood frog, Rana sylvatica, preyed on late instars and moths of the spruce budworm, Choristoneura fumiferana. The spotted salamander, Ambystoma maculatum, and the masked shrew, Sorex cinereus, also preyed on late instars of the spruce budworm.
Jennings, Daniel T.; Crawford, Hewlette S. Jr.; and Hunter, Malcolm L. Jr.
"Predation by Amphibians and Small Mammals on the Spruce Budworm (Lepidoptera: Tortricidae),"
The Great Lakes Entomologist: Vol. 24
, Article 2.
Available at: http://scholar.valpo.edu/tgle/vol24/iss2/2