My crew are all indoor cats. There are too many perils to cats that live in suberbs and busy residential areas. Triston, my 3 legged cat, lost his leg and was severly mangled in a car engine by the fan blade. Cats tend to climb up into warm engines in the winter and sleep. I rescued my cat Sprint from an engine before he could be hurt. We had a cat drown in the neighbour's pool, so all of my cats, who were all rescues have a far better life inside. I would love them all to be able to go out and enjoy the grass and nature, but as I say to people who raise their eyebrows at indoor cats - come on over and see their suffering.
I also respect the bird population -however the bird population is more at risk from lights being left on in high rise buildings.