Cnemarchus erythropygius
The Red-rumped Bush Tyrant (Cnemarchus erythropygius) is a striking and charismatic passerine of the high Andes, instantly recognizable by its vivid rufous rump and flanks, which contrast sharply with its otherwise grey and white plumage. Measuring approximately 20-22 cm (7.9-8.7 in) in length and weighing 40-50 g (1.4-1.8 oz), it exhibits a robust build, a relatively long tail, and a distinctive, often flattened, shaggy crest. Key identification marks include the bright rufous lower back and...
This species primarily inhabits the treeless high-altitude Andean páramo, puna grasslands, and rocky slopes, often near scattered low shrubs, rocky outcrops, or occasional stunted trees. It thrives in open, often windswept environments typically found at elevations between 3,000 and 4,800 meters ...
The diet of the Red-rumped Bush Tyrant consists predominantly of insects, including flies, beetles, grasshoppers, and other arthropods, which it captures by sallying from a perch or gleaning from the ground. It may occasionally consume small fruits or berries.
The Red-rumped Bush Tyrant is a diurnal and often conspicuous species, frequently perching on exposed rocks, low bushes, or fence posts, acting as a sentinel over its territory. It employs a classic 'perch-and-pounce' foraging strategy, sallying out to capture insects from the ground or in mid-ai...
The Red-rumped Bush Tyrant is an endemic resident of the high Andes of South America, with a broad but fragmented distribution. Its range extends from southern Peru, through western Bolivia, into northern Chile (Tarapacá and Antofagasta regions) and northwestern Argentina (Jujuy, Salta, and Tucum...
Least Concern
- The Red-rumped Bush Tyrant is the only species in its genus, *Cnemarchus*, making it a unique lineage among the diverse tyrant-flycatchers. - Its scientific name, *erythropygius*, directly translates from Greek as 'red-rumped', a clear nod to its most distinctive field mark. - It is a specialis...