Populations of pollinators are declining around the world. Pollinators require natural spaces with vegetation and flowering plants in which to live and forage for their food. Some main reasons for habitat loss include agriculture, mining and human development. Also, the introduction of non-native plant species which attract pollinators away from native species which are more nutritious and better food sources. Other explanations for declined pollinator populations include pesticides, climate change, and parasites and disease.