Many people know the sabertooth cat, not many know the entelodont and this book seeks to change that. After the astroid went BOOM struck the planet] and all life on earth bigger than a breadbox was wiped out, the mammals took center stage in evolution’s ever unfolding drama. This book is backed by field science and years of study. The mammals are accurately and beautifully illustrated. A great read for the mammal enthusiasts of all ages.