Starfish first appeared in the fossil record in the Cambrian. The first known asterozoans were the Somasteroidea, which exhibit characteristics of both groups. Starfish are infrequently found as fossils, possibly because their hard skeletal components separate as the animal decays. Despite this, there are a few places where accumulations of complete skeletal structures occur, fossilized in place in Lagerstätten — so-called "starfish beds". By the late Paleozoic, the crinoids and blastoids were the predominant echinoderms, and some limestones from this period are made almost entirely from fragments from these groups. In the two major extinction events that occurred during the late
Fiery spiny mouse Fiery spiny mouse The fiery spiny mouse ("Acomys ignitus") is a species of rodent in the family Muridae found in Kenya and Tanzania. Its natural habitats are dry savanna and rocky areas. It may be found as a commensal in human habitations. While most spiny mice are small in size, the fiery spiny mouse ("A. ignitus") is slightly larger, measuring at approximately 10 cm in length. The species gets its name from the hair on their coats that are connected in groups. These groups of hair are stiff guard hairs, resembling tiny quills and they are able to separate from