The young cuckoos fly

The young cuckoos fly to the south about a month after its true parent, following the same route by their instinct.  As it is a summer breeder and the voice or calls of Cuckoo can be heard until its migration to the south. As this old rhyme tells:  In April I open my bill, In May I sing night and day, In June I change my tune, In July far far I fly, In August away I must. So that is why we can not hear its calls during autumn time.

Cuckoo’s breeding behavior is the strangest wonders of natural world

Cuckoo’s breeding behavior is the strangest wonders of natural world

There are 54 species of Cuckoos

There are 54 species of Cuckoos on our planet, and four of them have been recorded in Mongolia, they are summer breeder.

Cuckoo’s breeding behavior is the strangest wonders of natural world

Cuckoo’s breeding behavior is the strangest wonders of natural world

Cuckoo Wasp (Chrysididae)

The Cuckoo Wasp has a metallic appearance whose colors range from blues and greens to reds and yellows. They lay their eggs in the nests of other wasps or solitary bees instead of building nests or collecting food. Once the Cuckoo Wasp's larvae hatch, they consume the host's eggs or larvae. 

Moreover, the Cuckoo Wasp has an armored body that can roll into a defensive ball when threatened.

Cuckoo Wasps live in lush forests and arid deserts. Their parasitic reproductive strategy also naturally regulates the population of their host species.

Cuckoo (Bird)

Cuckoos are birds in the Cuculidae  (/kjuːˈkjuːlɪdiː/ kew-KEW-lih-dee) family, the sole taxon in the order Cuculiformes  (/kjuːˈkjuːlɪfɔːrmiːz/ kew-KEW-lih-for-meez).[1][2][3] The cuckoo family includes the common or European cuckoo, roadrunners, koels, malkohas, couas, coucals, and anis. The coucals and anis are sometimes separated as distinct families, the Centropodidae and Crotophagidae, respectively. The cuckoo order Cuculiformes is one of three that make up the Otidimorphae, the other two being the turacos and the bustards. The family Cuculidae contains 150 species, which are divided into 33 genera.

The young cuckoos fly

The young cuckoos fly to the south about a month after its true parent, following the same route by their instinct.  As it is a summer breeder and the voice or calls of Cuckoo can be heard until its migration to the south. As this old rhyme tells:  In April I open my bill, In May I sing night and day, In June I change my tune, In July far far I fly, In August away I must. So that is why we can not hear its calls during autumn time.

Cuckoo’s breeding behavior is the strangest wonders of natural world

Cuckoo’s breeding behavior is the strangest wonders of natural world

There are 54 species of Cuckoos

There are 54 species of Cuckoos on our planet, and four of them have been recorded in Mongolia, they are summer breeder.