Humboldt's Sapphire

Humboldt's sapphire is 9 to 12.5 cm (3.5 to 4.9 in) long. Males weigh 6.3 to 6.6 g (0.22 to 0.23 oz) and females 5.8 to 6.4 g (0.20 to 0.23 oz). Males have a straightish coral red bill with a black tip. Females' bills have a black maxilla with red at its base and a mostly pinkish mandible with a black tip. Adult males have a deep blue forehead and center of the throat. Their crown is dull dark blue-green and the rest of their upperparts metallic green to bronze-green. Their tail is dark metallic green to blue with dusky gray tips on the outer feathers. Voice: Xeno-canto and Cornell University's Macaulay Library have only a few recordings of Humboldt's sapphire vocalizations. What is thought to be its song is "a repeated high-pitched phrase comprising hissing notes and trills, 'tee-tsee-see-tsee-see-trtrt-tsee-see-trtrt'." It also makes "a descending squeaky twittering" call.