Get those wretched cats out of there!!
Although I have got the hang of them and am accurate most of the times (pay close attention to their head - more specifically ears).
But, intitally I just couldnt get them write. I infact saved the captcha images and send them over to batty via y!m. He did a couple of captchas for me.
Its really stupid. Captchas are meant to test if your are human, not super human.