This occurs in species like Belding's ground squirrels and some tree squirrel species. A drey is the nest of a tree squirrel or a flying squirrel. They are similar to the tree squirrel in their preference of fruits and nuts. It is the largest native tree squirrel in the western coastal United States. In Walt Disney's "Bambi", Erwin performed the voice of a tree squirrel. The Santander dwarf squirrel "Microsciurus santanderensis" is a small tree squirrel endemic to Colombia. This is a large tree squirrel up to 60cm long from head to tail. As a tree squirrel, it lives among "Cecropia" trees, palms, and tree ferns. "Sciurus griseus" is the largest tree squirrel in the Sierra Nevada and Central California range. The Bolivian squirrel ("Sciurus ignitus") is a tree squirrel that is endemic to South America. The Amazon dwarf squirrel ("Microsciurus flaviventer") is a chipmunk-sized tree squirrel native to South America. Collie's squirrel ("Sciurus colliaei") is a tree squirrel in the genus "Sciurus" endemic to Mexico.