Cuckoo is a Dove-sized bird with ash-grey upper parts and dark-barred white belly. Cuckoos are very hard to spot. If you do manage to see a Cuckoo,You will probably see it as a dark, streamlined shape flying quite fast across fields between woodland. But it is quite likely that you have already heard one. A male Cuckoo announcing his presence, is making characteristic ‘cuck-oo, cuck-oo’ sounds.
Cuckoos are fairly common in all types of terrain, in woodland and in open country right up to mountain slopes. The most intersting thing about Cuckoo is that it does not make its' ow nest. They plant their egg into other species nests. The young Cuckoo hatches before the nesting bird’s own eggs and it pushes out the rest of the eggs.