[uf]

Sorry, but no: Don't keep cats indoors or on a leash.

Cats are predators. And they need freedom. If you're concerned for birds et al. don't get a cat.

Don't be cruel to cats to satisfy your need for a pet by forcing your view of how nature should work onto them.

[boogiewoogie]

Cats are domesticated. They made the indoor outdoor decision a long time ago.

[bambax]

My cat lives more than 50% of its time outside the house. It also can sit for hours on a window sill.