Funny, I only invented once the discovery of a hybrid for an April 1 joke (I called it Struthio anatinus, i.e. a mixture of an ostrich and a duck), but it might be interesting to create a mixture of a
horse, fish and albatros, of a
zebra, girafe and a horse, of a
tiger, bear and wolf, or of a
buffalo, camel and moose.
And there are some really weird animal "mixtures" in nature, which exist already:
(Ornithorhynchus anatinus = "birdnose" beaver and duck - and, perhaps, a big hornet for the sting)
There are, further, plenty of mythological creatures with two or more "crossings", like the chimera, etc. ...