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1987, Joseph F. Merritt, Guide to the Mammals of Pennsylvan, page 235:
Erethizontids are primarily herbivorous.[…]With their elaborate courtship behavior, the erethizontids are a fascinating group of mammals.
2010, M. G. Vucetich, A. G. Kramarz, A. M. Candela, “14: Colhuehuapian rodents from Gran Barranca and other Patagonian localities: the state of the art”, in Richard H. Madden, editor, The Paleontology of Gran Barranca, page 212:
The erethizontids, with four genera (including eight species) achieved their greatest known diversity, representing 22% of the total diversity.
2010, Peter S. Ungar, Mammal Teeth: Origin, Evolution, and Diversity, page 212:
Erethizontids inhabit a broad variety of habitats, from tundra to the tropics and from dense forests to open settings.