The species are incompatible and cannot interbreed.
A bouncing elephant. or a frog with a trunk. or an elephant that croaks.
An octophantopus.
Impossible.
A koalaphant.
An ibexphant.
An owlphant.
A giraffephant.
A zebraphant.
A walrusphant.
A raccoonphant.
A rhinodillophant.
A hedgedeerphant.