You know what... People who dump their cats, in the belief that they'll soon forget and be okay and find a new life, should be made to watch these clips. As should people who adopt cats and hand them back after a few weeks when puss fails to settle. We should also ask ourselves how long do cats feel grief as well.
And something that has always puzzled me about my own puds has just been solved... It was only after moving to me present home that it became possible to fit a cat flap. When we first got it installed, none of the cats had a clue what it was for and I had to teach them - all save one!
My Tilly saw the flap and immediate jumped through it and into the garden. She was the only one of my puds I'd adopted as an adult so methinks her old home must have had a cat flap as well. But I'd had her for 7 years myself, and she'd never seen one in all the time.