Oasis Hummingbird

The oasis hummingbird is 11 to 13.5 cm (4.3 to 5.3 in) long and weighs about 4 g (0.14 oz). Both sexes have a long, black, decurved bill. The nominate subspecies is larger and has a longer and stouter bill than the other two, but the three are otherwise alike. Both sexes have olive green upperparts with a cinnamon rump and uppertail coverts. Females have a small white dot behind the eye and males a longer white stripe. Males have an iridescent gorget that ranges from rosy violet to purple with turquoise to the rear. Their underparts are dull white with a dull green wash on the flanks. Voice: The oasis hummingbird's vocalizations have not been extensively recorded. What appears to be its song is "tzee-tzee-dee-dee, first ascending, then descending". Calls include a "melodious series of tick and tzee notes given at variable speeds and tone", "a rapid, thin liquid chatter", and ""a rich chew note".