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Another reason for having a concern on animal extinction is habitat loss. The loss of habitat, as a result of human need, is generally considered to be the most important reason of animal extinction. Cutting forests for building houses, farms and roads take animals to be lost a place to live. For example, each year, one percent of the world’s tropical forests are destroyed. In additional, that some species die purely while others are pushed into areas where they can’t have food and shelter is caused by human development polluting to animal’s habitat in natural landscape with petroleum products, pesticides, and others chemical. It not only makes one animal to be disappeared by human destroying, but also influences on many other species in food chain, so more than one species’ population to decrease. Richard P. Reading states that when approximately 90% of the habitat is erased, 50% of the species will be vanished. Habitat loss has been generally affected to significant loss of diversity and changing in ecosystem functioning, which leads species to get endangered or threatened.