"mammals. Bering Strait" changed to "mammals. The Bering Strait"

Original Paragraph:

^{P696:8, 61:3.4} 20,000,000 years ago was indeed the golden age of mammals. Bering Strait land bridge was up, and many groups of animals migrated to North America from Asia, including the four-tusked mastodons, short-legged rhinoceroses, and many varieties of the cat family.