Santa and his reindeer had a meltdown this year due to the warmest arctic temperatures ever. While they patch things up, the Fleas are working as replacements. The sleigh is pulled by Cat Flea and driven by Flea, best known as bassist for the Red Hot Chili Peppers. In the sleigh is a present for entomologists of the temperate zone, Snow Fleas.
Source: Living With Insects Blog