Teeth (casts) of two carnivorous prehistoric animals separated by tens of millions of years — the dinosaur Tyrannosaurus rex and cat Smilodon fatalis — from Valley Anatomical Preparations, Canoga Park, California. Below, souvenir postcards featuring Smilodon and Tyrannosaurus reproducing paintings by artist Charles R. Knight, from The Field Museum, Chicago, Illinois.
Smilodon life restorations (below) by artist Frederick E. Seyfarth as they appeared in the book The Golden Treasury of Natural History (1941) and reprinted in the booklet Life Through the Ages (1954), both authored by Bertha Morris Parker.
