Dark-rumped Swift

The dark-rumped swift is a swift found in Bhutan and north-east India and is a vagrant to Thailand. Its natural habitat is subtropical or tropical moist lowland forest, and it is threatened by habitat loss (Wikipedia, general species account).

That short account is the only source read for the Bhutan guide. No description, size, voice, diet or breeding information was found, so none is stated, and the entry is kept as short as the evidence allows.