Jan 23, 2017
Lycopsis longirostrus*, a sparassodont mammal from the Middle Miocene of Colombia, South America (~14-12 mya). About 35cm tall at the shoulder (1′2″), it was originally thought to be a dog-like or thylacine-like animal, but studies of a well-preserved specimen have shown that it had an unusual mix of anatomic features in its limb bones, with adaptations for both climbing and running.
It was probably a terrestrial ambush hunter, preying on rodents and other small animals, but also had the ability to grasp and climb trees in its densely forested environment -- especially useful for avoiding the land crocodiles that shared its habitat.
( * Often seen misspelled as L. longirostris )