Andrewsarchus mongoliensis was a land-dwelling, wolf-like mammal that lived in the Eocene epoch which was roughly between 45 and 36 million years ago. Everything known about Andrewsarchus was derived from its skull which was nearly 2 feet wide and 3 feet long, twice the size of a brown bear. It was 11 feet long in size and stood 6 feet tall; it is considered to be the largest carnivorous land-dwelling mammal known.
What's really interesting about Andrewsarchus is that it hunted or scavenged (scientists are unsure) for food on beaches and over time ventured further and further out into the ocean, eventually evolving into an ancient species of whale.
https://en.wikipedia.org/wiki/Andrewsarchus
http://pages.geo.wvu.edu/~kammer/g231/Whales.pdf
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