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.
Monte Iberia eleuth
The Monte Iberia eleuth (Eleutherodactylus iberia) is a small eleutherodactylid frog endemic to eastern Cuba. It is the smallest living frog in the Northern Hemisphere, about in snout–vent length. It is the third-smallest frog (and tetrapod) in the world, following "Paedophryne amauensis" and the Brazilian gold frog. It was first discovered in 1993 on Mount Iberia (Holguín Province), from which it gets its name, and exists in only two small regions of Cuba. Much remains unknown about this small creature.