The firsts photo above is a skull of an Okapi. It looks like a cross between a giraffe and a zebra, but the head resembles the giraffe:
Below you can see a live version:
The second skull is from this fellow - and I can't remember what it is ... a hippo?
These photos were taken from our recent trip to Disney World's Animal Kingdom. Could that skull you see above be from this fellow?:
But here is another guy I wouldn't care to run into "live":