The species are incompatible and cannot interbreed.
Yes, a bull elephant can easily kill a moose.
An octophantopus.
Impossible.
A koalaphant.
An ibexphant.
An owlphant.
A giraffephant.
A zebraphant.
A walrusphant.
A raccoonphant.
A rhinodillophant.
A hedgedeerphant.