Born shortly after the creation of the universe and composed of highly compacted matter from the hearts of collapsed stars, Imploding Kittens generate gravitational fields capable of capturing and consuming entire planets.
WARNING
They make poor house pets, because even small specimens exceed more than three astronomical units in size. Also, the Imploding Kitten is so long-lived that it will probably still exist after every star in the known universe expends its nuclear fuel and burns out. Only the most committed pet owners need apply.
BEHAVIOR
Will never come when you want them to. However, given their irresistible gravitational attraction, you will definitely come when they want you to.
HEALTH
Food intake should be carefully monitored; left to their own devices, Imploding Kittens will consume literally anything.