With one leg not two, he’s a great little hopper.
He has to be. Our knowledge can only be finite says Popper,

a philosopher of whom this little black bopper
has possibly not heard, not even a whisper,

but Karl has a point, a legitimate view:
the bird can’t imagine hopping on two.

From the path to the compost, the rail to the bin,
he’s perfected the art of hopping on one

a hop left then right, like a one-legged trooper
adroitly avoiding coming a cropper,

backwards and forwards, forwards and backwards:
thirteen ways of hopping for a blackbird.

When fate deals you a bad hand or rather a bad leg or rather a non-existent leg it may seem improper
but as mentioned our knowledge can only be finite says Popper:

so when fate deals you an unfair cop,
what can you do but live in hop?

– James Norcliffe