Owing to their large body size, the larvae and pupae ofgiant silkworm moths (Saturniidae) are ideal food for many animals. Winter predation on the pupae of Hyalophora cecropia (L.) in Illinois by birds (Waldbauer and Sternburg, Ecology 48:312-315, 1967) is a well known example.
Young, Allen M.
"Predation on the Pupae of Saturniidae (Lepidoptera) by Gray Squirrels in Wisconsin,"
The Great Lakes Entomologist: Vol. 15
, Article 10.
Available at: http://scholar.valpo.edu/tgle/vol15/iss2/10