This is a very tiny comet. In fact this is Rosetta's Comet and we recently landed a probe on it as it flew through space. This is what Rosetta's Comet looks like when compared to the city of Los Angeles, California.
The smallest hummingbird, Bee Hummingbird or Zunzuncito (Mellisuga helenae), is a species of hummingbird that is endemic to Cuba and Isla de la Juventud. Wikipedia says it grows to cm and is not only the smallest hummingbird, but its also the