A mundane sooty-black bird is uniquely transformed by a pair of vibrant yellow pantaloons

A couple of yellow pantaloons transform a very boring sooty-gray bird.

This yellow thigh brush finch (Atlapetes tibialis) is a black finch with a long tail (7.8/8.5 cm) and noticeable bright yellow thighs, which gives the bird its name.

A mundane sooty-black bird is uniquely transformed by a pair of vibrant yellow pantaloons

The slate gray tint, on the other hand, may occasionally extend to the complete ear-coverts, cheek, chin, and throat.

The bill is black with a pointed tip. The eyes have a rusty brown color. Feet and legs are tan.

Males and females have extremely similar appearances; however, she has a somewhat longer tail.

The young bird looks like an adult bird, but its top portions are duller.

This species is only found in the highlands of Costa Rica and western Panama.

A mundane sooty-black bird is uniquely transformed by a pair of vibrant yellow pantaloons

The Yellow Thigh Finch favors primary and degraded humid mountain forests, where it is prevalent in the understory.

It is also found in secondary growth, bamboo-lined ravines, adjacent shaded meadows, and bushy clearings.

Costa Rica’s breeding season lasts from March through May.

The female constructs a hefty cup-shaped nest from of dried fresh leaves and dry grass.

The cup’s lining is made of fine plant fibers or bamboo leaves.

A mundane sooty-black bird is uniquely transformed by a pair of vibrant yellow pantaloons

It is located between 50 centimeters and 4.5 meters above the ground, in coarse grasses, bamboo, or heavily foliage trees, and is frequently found in ravines covered with vegetation, particularly bamboos.

The Yellow thigh Finch has a limited range and is categorized as “common” to “very common,” especially in the area’s highlands.

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