The osprey is usually placed in a separate family ( Pandionidae ) , as is the secretary bird ( Sagittariidae ) , and the New World vultures are also usually now regarded as a separate family or order .
The osprey is usually placed in a separate family ( Pandionidae ) , as is the secretary bird . The New World vultures are now usually a separate family or order .
A National Museum of Natural History database for the study of ants , wasps , bees and termites describes the archedictyon as : According to a 1999 paper on the evolution of flght in Palaeoptera the cross veins of some Palaeodictyoptera may be an adaptive feature .