Cactus is a type of plant that can store large amounts of water and survive in extremely hot and dry habitats. There are around 2000 different species of cactus that differ in size, shape, color and type of habitat. Almost all cacti are native to deserts and dry regions of South and North America. Due to their attractive morphology, cacti can be found throughout the world today. Over collecting and habitat loss are major threats to the survival of cacti in the wild.