Mercury (planet)
Mercury is one of four terrestrial planets in the Solar System, and is a rocky body like Earth. It is the smallest planet in the Solar System, with an equatorial radius of . Mercury is also smaller—albeit more massive—than the largest natural satellites in the Solar System, Ganymede and Titan. Mercury consists of approximately 70% metallic and 30% silicate material. Mercury's density is the second highest in the Solar System at 5.427 g/cm, only slightly less than Earth's density of 5.515 g/cm. If the effect of gravitational compression were to be factored out from both planets, the materials of which Mercury is made would be denser than those of Earth, with an uncompressed density of 5.3 g/cm versus Earth's 4.4 g/cm.
Thumbelina (horse)
Thumbelina (born May 1, 2001) is a dwarf miniature horse and the world's smallest horse. She stands tall and weighs , and received the title of world's smallest from Guinness World Records. Thumbelina was born in St. Louis, Missouri. Her owners, Paul and Kay Goessling, and her handler, Michael Goessling, care for her along with other miniature horses on their farm in Ladue.