Chough

What is Chough?

A chough is not a single species but a name applied to three distinct crowlike birds characterized by their down-curved bills.¹

The term primarily refers to two species within the family Corvidae:

• Common chough (Pyrrhocorax pyrrhocorax): A red-billed bird found in rocky uplands and sea cliffs ranging from the British Isles to China. It is sometimes referred to as the Cornish chough the Cornish chough.¹³
• Alpine chough (P. graculus): A yellow-billed bird inhabiting high mountain regions from Morocco and Spain to the Himalayas.¹

Both species are approximately 38 cm long, possess glossy blue-black plumage, and are known for their gregarious nature and aerial acrobatics.¹²

Additionally, the white-winged chough (Corcorax melanorhamphus) belongs to a different family, Corcoracidae. Native to Australian forests, this bird is physically similar to the corvid choughs but features white wing patches and a black bill. Unlike its counterparts, it is known for building mud-walled nests cooperatively.¹

What other birds belong to the Corvidae family?

The Corvidae family is a diverse group of over 120 songbird species within the order Passeriformes. These birds are known for their high intelligence, strong social organization, and stout bills.⁴

Beyond the chough, the family includes several well-known groups categorized by their physical characteristics and regional prevalence:

• Larger, sombre-colored species: These birds are found globally, with the exception of South America. This group includes the crow, raven, rook, jackdaw, and nutcracker.⁴
• Smaller, colorful species: Often featuring crests or long tails, these are most numerous in South America and southeastern Asia. This group includes the jay and the magpie.⁴

While crows and ravens are often confused, they are distinct species within the same genus (Corvus) and family, both exhibiting the complex social behaviors and problem-solving abilities characteristic of the Corvidae family.⁵

How do choughs adapt to living in high mountain environments?

The alpine chough (Pyrrhocorax graculus) is specifically adapted to high-mountain environments, including the Himalayas, where it has been observed at elevations as high as 18,600 feet (5,700 meters).¹⁶

While specific physiological studies on the chough’s high-altitude survival are limited in the provided text, birds generally thrive in such environments through several key adaptations:

• Efficient Respiration: Birds possess a highly efficient respiratory system that allows them to extract more oxygen from the air than mammals, which is essential in the thin atmosphere of high altitudes.⁷
• Aerial Agility: Choughs are noted as aerial acrobats, a trait that likely assists them in navigating the complex wind patterns and rugged terrain of mountain ranges.¹
• Energy Management: Like other high-altitude birds, they may utilize thermal updrafts to gain elevation and conserve energy, and they possess lightweight, pneumatic bones that facilitate efficient flight.⁷

These traits allow the alpine chough to inhabit rocky, high-elevation zones where many other species cannot survive.¹

What makes the white-winged chough’s nesting behavior unique?

The white-winged chough (Corcorax melanorhamphus) exhibits a distinct nesting behavior characterized by its cooperative nature. Unlike many other birds, these choughs construct a mud-walled nest high in a tree, which is both built and utilized by the group cooperatively.¹

It is important to note that while the white-winged chough is often grouped with other birds called choughs, it actually belongs to the family Corcoracidae, rather than the Corvidae family that includes the common and alpine choughs.¹