Another point of view ...
Well I don't have a problem with it - their wee heads are about 1/2 inch wide at most - they are more feather than substance.

Their shoulders would prevent any further entry. I think I worry most about their feet getting caught in toys. This one has lots to grab.
The classic plastic ring, hanging toy is an example that works really well for them - they put their whole body thru the rings- which are 1 1/2" dia. I bought a wooden version with square 'rings' - Laker tried to put his body thru the rings but only could accomplish it on the first & last ones that only have one ring blocking the opening. When he couldn't fit his body inside he gave up after a few tries. We ended up using it as a swinging bridge.
This toy looks like a lot of fun - something I might try on the outside of the cage - hanging down so they can destroy it - I use things like this to cover all the paint Rio is taking off Laker's cage - one side is slowly being covered.
I look forward to hearing from your customer/friend - hope they join PC. If they choose a Budgie they are as much fun as any bird & very funny & smart. They also fit in most housing situations & still have the space to fly - just had to put in plug for the little guys.
