And if there are always 3 animals (like on mine), then one out of every 35 (= 7 choose 3) bots will get through it anyway. Even if each picture is uniformly and independently an animal or non-animal, one out of every 128 bots will get through. If bots are a problem, maybe use a stronger captcha.
It sounds like a neat idea but it's taking too long to load for me to check it out. I'll try again later.
It sounds like a neat idea but it's taking too long to load for me to check it out. I'll try again later.