Rabbits are small mammals of the lizard family Lizard family and are found in some parts of the world. Eight different genera in the family are classified as rabbits, including the European rabbit (Oryctolagus cuniculus), the cottontail rabbit (Sylvilagus genus), and the Amami rabbit (Pentalagus furnessi, an endangered species of Amami, Japan). There are many other species of rabbits, and these, along with pikas and hares, make up the order Rabbit. Males are called male deer and females are called doe; young rabbits are kittens or kittens. Rabbit habitats include meadows, woods, forests, grasslands, deserts and wetlands. Rabbits live in herds, and the most famous species, the European rabbit, lives in underground burrows or rabbit holes. A group of caves is called Warren. More than half of the world's rabbits live in North America. They are also native to southwestern Europe, Southeast Asia, Sumatra, some of the islands of Japan, and parts of Africa and South America. In much of Eurasia, they are not natural, and there are many species of hares. Rabbits first entered South America relatively closely as part of the Great Exchange of the United States. Most of the continent has only one breed of rabbit, tapeti, while much of the South American Southern Cone has no rabbit. The European rabbit has been introduced all over the world.