What is it?

Well, first glance - particularly the white on the ears - suggests some sort of small cat, but that just seems too easy. Could it be a genet, perhaps? (Damned if I can remember if I've ever seen the back of a genet's head...)

Bigfoot!

^ The floodgates have been opened...

It's a trick question! What we're seeing is actually TWO creatures - a ropen battling a gorgonopsian over the carcass of a beaked whale.* =) (Oops is this Laelaps or Tetrapod Zoology?)

In all seriousness... Black-footed cat?

* To the uninitiated, every time Darren Naish posts a picture of an animal that asks us to guess its identity, we like to bring up animals that he has blogged about before, or the silly answers left by some commenters.

From the coat colour I would guess fishing cat, but the ears don't look right. Is it a hybrid of some sort?

Actually, after some careful thought and a bit of Googling, I think it's a fishing cat.

I think it's a tasmanian devil, and for some reason I think it may be pissed off.

I'm also suspecting fishing cat (Prionailurus viverrinus), or possibly a European wildcat (Felis sylvestris ssp. sylvestris).

Ooops, misspelling...that's Felis silvestris silvestris ("of the forest", not "sylvestris", "of the chaser of Tweety Birds")!

It does look like a cat, but I'll go with my first impression, a Wombat!

Yes that's right, a tabby wombat.

I'm with the "small feline", Prionailurus seems like a good bet, but I'll say P. bengalensis just to cover the spread.

mistressofscience beat me to it, but it looks like a Tasmanian devil to me as well.

It's the creature from the Gable dogman footage. The sequence of images will end with a shot of the inside of the mouth...

Felis sylvestris sylvestris?

I'm going to get away from the cat theme and go with grey fox.

Though no one else has commented on the first paragraph, behold the power of social media. ;-)