Thank you everyone for your lovely messages - both on this post, and the other post dedicated to Sandy
To answer a couple of the questions/comments -
1. Yes, these are my photos. Everyone's been very kind - I am not a professional photographer, though I guess I do take the hobby pretty seriously. If anyone's got any great ideas for setting up interesting cat photos, would love to hear them. I always thought that they cats would look cute playing against the green grass and flowers of my garden (and for technical reasons too - the light is bright enough outside to allow for faster shutter speeds - which provides all sorts of benefits for freezing the action without blur - or allowing for smaller apertures and thereby better depth of field...oh ok I'm getting techy and boring, sorry!)...but as kittens, they're indoor cats at the moment (and may well stay so) so don't want to create all sorts of problems by letting them out. Hence I have to use window light, or flash. May just need to find a green background for that next shot
2. It truly was terrible with Miss Sophie. She had been incredibly affectionate the day before she died - she was a very active Savannah, though generally a little more highly strung than Anakin, and not as much of a "lap cat". On the night before she died, she came into our room and stayed on the bed for an hour or so - active, but keen to be in our company and stroked and cuddled. We commented on how extra friendly she was being. She trotted off at midnight...but when I went down to feed the cats in the morning, she was crouching in the corner of the room. Unlike normal morning, she didn't rush for her food. I went over to her, and could see that something was up - and that she'd gone lame in her hind legs and couldn't stand. In a panic, I rushed for the emergency vet number - it was a Sunday - but by the time I was back in the room, literally 3 minutes later, she had keeled over and was dead, with poor Anakin nuzzling her to wake up. She was still warm by the time I got to the vet to confirm that there was nothing that they could do (I had somehow prayed for a miracle and that she wasn't really dead). I did discover I am not very good in moments of panic - rather than calmly getting to the vet, I was a complete mess (made me worry about how calm I will be if something, god forbid, ever happens to my children). It was so completely out of the blue. The vet said that the speed of it, and lack of any other visible signs, sounded like a blood clot. They were going to do a post-mortem, but decided it was highly unlikely to find anything. The breeder has been very good, and replaced her with another kitten - we were going to go with another Savannah, but the new Savannahs kittens got sick over the winter. So we've switched to a bengal (Sandy), and in many respects I actually think she's prettier and cuter.
3. Giardia is a parasite in the intestines - not always easy to detect - but it creates diarrhea and slows down absorbtion of food - hence the reason why Anakin wasn't putting on weight. We're not sure where he picked it up from - I think he probably arrived from the breeders with it. Strangely, it never affected Miss Sophie (much worse things were in store for her, bless her). For a long time the vet thought that he just had an inflamed bowel; but when we finally found the giardia bug we were able to treat him with metronidazole (panacur didn't seem to shift it) and he began to recover within a week.
Anyway, I'll keep taking photos and will post more - just let me know if they become boring.