Pond is preferred breeding ground for frogs and some insects. Though terrestrial, adult frogs consume invertebrates such as annelids, gastropods and arthropods including mosquitoes present in pond water and form an important part of ecosystems as both predator and prey. They reflect back to us the environmental health of our planet. Their permeable skin makes them especially vulnerable to environmental contaminants, such as agricultural, industrial, and pharmaceutical chemicals, particularly endocrine disruptors. Studies have shown that 50 frogs can keep an acre of a rice paddy field free of insects and can keep a check on insect populations including mosquitoes.