Glittering-bellied Emerald

Fascinating facts about the Glittering-bellied Emerald

• In 2006 a taxonomic showdown showed that the hummingbird long known as Chlorostilbon aureoventris should actually be called Chlorostilbon lucidus, because the older name has priority, reminding us that even century-old scientific labels can be upended by careful paperwork.
• The male glittering-belly emerald barely tips the 10-centimeter mark and weighs as little as 3 grams, while females are a centimeter shorter but can weigh up to 4.5 grams, a size difference that lets the two sexes zip through the same garden flowers without bumping into each other.
• This tiny bird thrives from sea level up to 3,500 m (about 11,500 ft), but most individuals are spotted between 500 and 3,500 m, showing how a species can span deserts, savannas, forest edges, and city parks across five South-American countries.
• Instead of guarding a single flower, the emerald follows a "trap-line" circuit, sipping nectar from many plants and even piercing flower bases to obtain hidden juice.
• From August through February the female builds a camouflaged cup nest from plant fibers, bark and spider silk, incubates two eggs for roughly 14 days, and then watches fledglings leave the nest after 20-22 days.

At a glance

About the Glittering-bellied Emerald

The glittering-bellied emerald (Chlorostilbon lucidus) dazzles with a bronze-to-bronzy green belly that shimmers more intensely than its golden-green upperparts, while the male’s crown glints dull bronzy green and a dark steely-blue tail flickers with a slight fork. Females, slightly smaller at 7.5–8.5 cm, wear a subtle grayish-white streak behind the eye and a whitish throat that deepens to pale brownish-gray on the breast, their bills split between black outer halves and red inner tips. These hummingbirds flit between 4 and 12 m above the ground in scrublands, savannas, grasslands, forest edges, and even urban parks across Argentina, Bolivia, Brazil, Paraguay, and Uruguay, thriving from sea level up to 3,500 m, though most are seen between 500 and 3,500 m. Their feeding strategy is a meticulous trap-lining circuit, sipping nectar and, when needed, piercing flower bases, while also hawking insects and sipping honeydew. A surprising trait is their vocal repertoire: a high-pitched, cricket-like trill punctuated by a dry, scratchy rattle and a rapid descending cascade of "tsee-tsee-tsee-tsu-tsew" notes during confrontations, a soundscape that echoes through the open habitats they dominate.

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