Swifts save us from illness.
The swift is a predator of flying insects.
A lot of these flying insects carry a lot of tropical diseases.
Mr Edward Mayer has been researching into the swift and thinks that if the swift becomes extinct illnesses such as green nile fever and malaria will spread across the earth and infect europe.
Swift numbers are dropping and Mr Meyer, among others are trying to get people involved in providing nesting sites for swifts