Falcon Hawks searching for food at Sylhet's Parairchak garbage dump yard in Sylhet. They also play a role in the Ecological cycle. The falcon is a diurnal bird of prey in the family Falconidae of the class Cuculiformes. Out of the 9 species in Bangladesh, 5 species are migratory. Among them, the dune falcon bird is considered as an almost extinct species of bird in the animal world. Falcon Hawks are also a great asset to many farmers, killing millions of crop-destroying animals and insects. Sylhet, Bangladesh.