Tea pets are little mascots that grow with you on your tea journey. You always want to "feed" the pet by discarding your rinse(if you do so) or left over tea over their body's so that they change colors(stain) over time. The more tea you drink, the more your pet will be fed, the more he/she will stain, and the happier he/she will be! My Pixiu does have the ability to change colors a little bit. When cool, he is a deep gold color(the right frog in the photo above) and when hot water, or tea, is poured over his body he turns a bright vibrant gold(frog on left). I don't know a lot about tea pets but I can say that I am quite excited to have a little guy around who brings me coins and like to drink tea! I think we will be great friends.