|Toby demonstrates the high pounce|
What do we gain by four legs? For a start, increased stability, the ability to manage on only three legs if we lose one in an accident and more power to the back legs. We jump high and land so gently that we can grab a mouse at the same time.
If humans do a high jump, they land in a heap. They can't pounce properly.
The only advantage they gain are hands with fingers and thumbs. Good for opening cat food tins and envelopes, I guess. While we can carry only one mouse at a time in our mouths, they could carry two - one in each hand. Only they don't.
Ever seen a human trying to stalk silently? It's pathetic. Their immobile feet plonk down on the earth's surface so heavily that any decent animal can hear or feel this for yards and yards. And because they have to stand on their back legs, they cannot slink properly either.
Hopeless for slinking. Hopeless for pouncing. But good for opening cat food containers.