Imperial staircase to imperial staircases are more often of just two flights (hence the name) leaving the ground symmetrically to join one common destination. Occasionally, especially in the architecture of the Sicilian Baroque, they will leave the ground as one flight and then divide, but this is less common. One may also see an imperial staircase in the form of two flights rising to join and then continue as one flight, but this is rare. Imperial staircase An imperial staircase (sometimes erroneously known as a "double staircase") is the name given to a staircase with divided flights. Usually the first flight rises
Imperial pigeon al., and followed here. Four species of imperial pigeon are found in Philippines and Sulawesi. All have a distinct pale band across the centre of the tail, and a rich green or purple dorsum. This grouping shares characteristics and distribution with "Ptilinopus", and forms a link between the genera. The pink-belled ("D. poliocephala") and the white-bellied ("D. forsteni") imperial pigeon are similar and allopatric species. The Mindoro ("D. mindorensis") and the grey-headed ("D. radiata") imperial pigeons differ in size but are otherwise similar. The spotted imperial pigeon ("D. carola") is sympatric to "D. poliocephala", and though smaller, short tailed and