Researchers at Case Western Reserve University and two other universities have discovered the 13-million-year-old fossils of a pair of new species of extinct hoofed mammals known as "litopterns" from a site in Bolivia.
The animals, which look similar to small moose or deer in a paleoartist's rendering, are being dubbed Theosodon arozquetai and Llullataruca shockeyi, ungulates...