Space Bug Can Openers

One of my hobbies is aquarium-keeping. I mostly keep and breed guppies and swordtails (the guppies somewhat more successfully than the swords), but I've also gotten into raising inverts. A particular favorite of mine is the dwarf crayfish, Cambarellus patzcuarensis. They have an amusing habit of raising their claws like they want to fight when you stick your hand in the water, but bug out if your hand gets too close and they realize the size differences involved. We named the first one Mister Pi