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With 14 cm a medium-sized Swift, very similar to White-chinned Swift.
Probably only identifiable in hand by tail/tarsus ratio.
Probably endemic to south-western Mexico. Obviously very rare. After the species was described based on one specimen found in the wild, other old birds in museums were identified as this species too. There is only one probable sighting in the field.
Mountains in Mexico, probably montane cloudforest with gorges and waterfalls.
Nothing known. A presumed bird of this species was seen in a flock together with other Swifts.
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