Perhaps if I were Korean I'd understand this a little better, but a rabbit with a hugely bloated cranium just isn't the sort of thing I'd think to base an MP3 player on. Still, Mashimaro is vaunted as Korea's answer to Hello Kitty, so I suppose there must be thousands of girls there desperate for this 54 x 38 x 38mm media player.
The Mashimaro PMP weighs a scant 19g and has 2GB of onboard storage. The tiny ears light up (you mean those on your rabbit don't?) and are also the 5-way controller. Around the back there's a headphone jack and USB connector, and the whole thing is good for 9hrs of playback from the rechargeable battery.
If you're in Korea, and you fancy a slice of Mashimaro, the PMP will set you back the equivalent of around $45. It's available in white, sky blue or soft pink, and plays MP3, WMA, WMV, ASF, OGG, APE, WAV and ACT files.