The correct term is kestrel, with tilde. It is one of the common names that receives a very common type of falcon. Its scientific name can be Falco sparverius and belongs to the falconidae family. Other common names it receives are: falcon, falcon, falcon, common falcon, common falcon, whoseyo, kestrel, hawk or chilico. The name is due to the quality it has to hover in the air or suspend itself in the air in order to hunt its prey.