This review aims at giving all the information and the key role of birds as bio-indicators of environmentalhealth and help to detect pollution in the environment such as water, air, soil, noise pollution, and heavy metal contamination. Birds are useful to detect forest recovery that properly helps forest management and they have many useful roles to detect global warming and climate change. Some birds help to detect hotspot areas of biodiversity and a recent study even says that birds can tell us about historic events of pollution specifically air pollution. Therefore, many problems according to environmental health and habitat destruction can be measured in a very cost-effective and easy manner with the help of birds as bio-indicators.

Keywords : Birds, Bio-indicators, Pollutions, Heavy metals, Forest recovery.