When I first saw this, it looked like a zebra had sprouted a horn. So, what is that white object behind the zebra?
It's wood- looks like a tree was uprooted, with one root sticking up in the air. You're right- the angle makes it look like a big caribou antler growing out of the zebra's skull.
You can see this in better detail by enlarging the picture- in Windows, hold down the CTRL key and hit "+" as many times as need be to find the best balance of image size vs. resolution. CTRL and "-" reverses the process, while CTRL and "0" returns you to the default image size.