| Aglaiocercus hellsterni|
It was named in honour of the author's grandmother.
The Hellstern's Sylph is mainly shiny green in colour. The upperparts range from light green to greenish-blue while the underparts are dark green. The crown is mainly blue to indigo. The tail is indigo to purple. Wings are bluish-green. Feet and bill are black and eyes are dark. Female is similar, but with a shorter tail.
Unlike the Long-tailed Sylph, it does not have a gorget spot and the sexes are similar.
Lives in open woods, forests, parks, gardens and mountains up to 2,000 m (6,600 ft). Found throughout Shire and Devonshire. A vagrant to Aquitani. Migrates to Africa, throughout the Congo and residential areas.
It is based on a Long-tailed Sylph. The sexes being similar but with males having a longer tail is based on Scissor-tailed Flycatcher.
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