Cuckoos are birds known for their distinctive calls, often resembling the sound 'cuckoo.'

They belong to the family Cuculidae and are found worldwide.

Cuckoos have a slim body, long tail, and pointed wings.

Many cuckoo species are migratory, traveling long distances between breeding and wintering grounds.

Cuckoos are known for their unique reproductive strategy called brood parasitism.

Female cuckoos lay their eggs in the nests of other bird species, leaving them to be raised by the host birds.

Common cuckoos are known for their iconic 'cuckoo' call, heard in spring and early summer.

Cuckoos are opportunistic feeders, consuming insects, caterpillars, and small fruits.

Some cuckoo species have specialized diets, such as eating hairy caterpillars or large insects.

Cuckoos are often secretive and may be more often heard than seen in their habitats.

Their coloring can vary widely, with some cuckoos having vibrant plumage and others being more subdued.

The calls of male cuckoos are used to establish territory and attract mates.

Cuckoos are known for their excellent flying abilities, covering large distances during migration.

In some cultures, the cuckoo's call is associated with the arrival of spring.

Cuckoos play a role in controlling insect populations, especially caterpillars.

Some cuckoo species are brood parasites of other cuckoos.

The Eurasian Cuckoo is famous for its long migratory journey from Africa to Europe and Asia.

Cuckoos have zygodactyl feet, with two toes pointing forward and two pointing backward.

They are well adapted for perching on branches and navigating through dense vegetation.

Cuckoos have a relatively short incubation period for their eggs, as the host birds raise the chicks.

The fan-tailed cuckoo is known for its distinctive fan-shaped tail during display flights.

Cuckoos are often solitary birds, but they may gather in larger numbers during migration.

Some cuckoo species mimic the calls of predatory birds to deter potential threats to their nests.

Cuckoos are featured in folklore and mythology, symbolizing various themes such as mystery and deception.

Cuckoo chicks often hatch earlier than the host birds' chicks, giving them a competitive advantage.

The shining cuckoo of New Zealand is known for its iridescent green plumage.

Cuckoos are not known for building their own nests but rely on those of other birds.

Cuckoo chicks may evict host eggs or nestlings from the nest, ensuring more attention from the host parents.

The Madagascar Cuckoo is known for its long, decurved bill and distinct vocalizations.

Cuckoos are monogamous during the breeding season.

In some regions, cuckoos are considered symbols of good luck, while in others, they may be viewed with superstition.

Cuckoos may have different migratory patterns, with some flying long distances and others staying in one region year-round.

The cuckoo's ability to lay eggs that mimic those of their host species is an evolutionary adaptation.

Cuckoos are part of ecosystems worldwide and contribute to biodiversity through their interactions with other bird species.

Some cuckoo species have declining populations due to habitat loss and changes in insect availability.

Cuckoos have complex vocal repertoires, including various calls used for communication and courtship.