Rockin’ around… the uh… what? Meet the Christmas tree worm (Spirobranchus giganteus). This “festive” marine worm lives on tropical coral reefs around the planet. Its name is derived from the spiny fir trees that are emblems of the holiday season. But at just 1.5 inches (3.8 cm) in size, you won’t find any decorations hanging from this species’ “branches.” While part of the worm is buried in the coral, its colorful appendages are used for breathing and for snatching plankton to eat. In ideal conditions, Christmas tree worms can live for up to 40 years!