I got out a toy earlier that makes a sound like a bird. It's very realistic (it was a xmas pressie from someone in the US) and Mosi has always been a bit tentative around it when I first get it out, but he is usually ok after a few minutes. I got it out tonight and shortly after Mosi disappeared and I couldn't find him anywhere. I was calling him but he didn't come. Eventually I found him lying under the bed. He stayed there for almost an hour and wouldn't come out no matter what. I was gettng worried that he was sick but eventually I waved a piece of twine under the bed and he started swiping at that. A few minutes later he came out and he's now on my lap. I can't believe the little lad is so nervous of a bird sound (he can hear the real thing everyday as there are lots of trees outside my flat) as he's usually such a bold lad. Maybe he thinks it's another cat (although I think it's a very realistic bird chirrup, it does also sound very like Mosi when he chirrups!) or something. Very odd though. I'm assuming it was the toy that sent him under the bed as I can't think of anything else. Not at all like my little Mosi.