Well on advice here I bought herself a frozen mouse today. After it was fully defrosted I gave it to her and left her in the utility room (she has a funny thing about people watching her eat), came back and it was gone. No trace of it at all just disappeared. I'v searched every inch of the room (it's a small room so not hard) so I can only presume she ate it. She's never (as far as I'm aware, she's been indoors only since about 9-10 months old, she's now 6 and a half) caught or eaten a mouse before so I honestly wasn't expecting her to eat it (but hoping she would). But I thought cats usually leave behind certain bits (intestines?), or at the least I was expecting a bit of a mess. It was only a baby one, or so I was told by the woman who probably thought I was mad, about 2 inches long (not inc. tail). So those of you that feed frozen mice what do you think, eaten or very well hidden?