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A further reason for having a concern on animal extinction is introduced invasive species. Invasive species appeared in biodiversity rich areas destroy habitats of endemic species and impact to their secure surviving. Invasive species brings about roughly 42% of endangered or threatened species are at risk mainly. There are many reasons of damaging to animals in wildlife. When new and aggressive species are introduced into ecosystem, they threatened to native animals such as preying on native species. The changing of the food webs in an ecosystem is destroyed by non-native species, which might not give food sources to wildlife species. Invasive species can modify a wealth and diversity of species that are crucial habitat for native wildlife animals, which leads to the decreasing of biodiversity. Non-native species can break the conditions in an ecosystem such as soil chemistry changed or the intensity of wildfires. For example, Asian carp which has a catchall of silver, bighead and black are fast-growing fish that destroy food and habitat of native fishes. For instance, the European red foxes are introduced to Australia for the hunting sport, and this predator takes many native animals to extinct nearly.