In my mind's eye, Shakespeare is a huge, hot sea-beast, with fire in his veins and ice on his claws and inscrutable eyes, who looks like an inchoate hump under the encrustations of live barnacle-commentaries, limpets and trailing weeds.
When cats scratch the furniture, it's only because they're trying to sharpen their claws, which means they get so long that they want to grind them down. So if you trim their claws routinely, it helps tremendously.
Endurance, after all, is the only reason we even exist. We think of ourselves as nature's deadliest animals, but the truth is, a naked human is the biggest wimp in the wild. We have no fangs, no claws, no strength, and no speed.
With a few exceptions, birds are not to be trusted; it is not normal to have such soft, vulnerable bodies bookended with slashing beaks and razor-sharp claws. It is as unnatural as an armed marshmallow.
What dinosaur traits are missing from an ostrich? The ostrich has a toothless beak, but there are mutations that cause teeth and claws to come back to their mouth and limbs. You need to replace the feathers with scales, but there are no feathers on their legs and feet, so you just need to make its whole body like its legs are.