1) Columba palumbus 2) Pigeon 3) Ringdove 4) Wood pigeon 
• (n.) The ringdove or wood pigeon.
Cush'at noun [ Anglo-Saxon cusceote .] (Zoology) The ringdove or wood pigeon. « Scarce with cushat's homely song can vie. Sir W. Scott. » 
The cushat or wood-pigeon or ring dove (Columba palumbus) is a common British bird. Their numbers exploded around 1900 to the present day epidemic in towns and cities due to the destruction of their natural enemies, the birds of prey.
the ringdove, Colomba palumbus.