A species of mutant platypus monkeys, from an alternate universe, who spend their time entering our world through the magical portals we call 'dryers' and 'washing machines' to steal our socks and sell them on the black market for huge sums. The more daring ones have been known to steal both socks or even a pair of leggings. The only way to stop them is to pour a mixture of sour cream, pickle juice, and scrambled eggs (not soupy) into every washer/dryer load.
Look at this! Half my socks are gone! Damn those bumble squishes!