Everyday, animals demonstrate intricate connections between them, us and our surroundings. Although some environmental pollution is a result of natural causes like volcanic eruptions, most is caused by human activities. Amphibians are vertebrates and include approximately 4,400 existing species.
Amphibians are in most cases, small, diverse, and sensitive to environmental variability.
They can be good indicators of habitat diversity, biological variety, and local stressors on the environment. They are bathed in both water and air. They live outdoors on land and water, and their skin, larvae, and unshelled eggs are constantly exposed and in contact with the substances in their surroundings. Other species' populations have disappeared or are declining in numbers in Brazil, Mexico, Australia, India, Bangladesh, Portugal, Taiwan, the United States, and Norway. There is no one apparent cause for these declines.