We used to see frogs, but I haven't seen any for a couple of years now, and I do see butterflies and possibly a wren or two. The one bird I do notice a fair bit is the swift.
When you say orange slug, do you mean a brownish orange? If so, we get loads of those around here. If I kill slugs I do it by chopping them in half with a spade. I feel a bit guilty, but it's a case of them or me (or at least my precious plants) and hopefully their death was very quick.
Anita Bensoussane wrote: As for weeds, I'm like Fiona - I just pull them up (eventually, anyway!)
I've never used ant powder. We did have a problem a few years ago with them in the house, so I used ordinary talc to try and deter them. I also wiped the kitchen floor with vinegar which is supposed to stop them. Years ago I poured boiling water down a hole that flying ones were swarming out of (outside), but afterwards I worried if I'd killed any earthworms or other insects.