Space fleas are little bloodsucking creatures that give especially itchy bites and only are active at night. Some were trained performers at Joko's Intergalactic Circus, but were left behind with a group of acrobatic giraffes when the circus shut down. Tonka and his mammoths discovered the wreck and took the animals with them, placing the fleas on the giraffes to make them roar and act like monsters.