https://pmc.ncbi.nlm.nih.gov/articles/PMC38941/
Does behavior reflect phylogeny in swiftlets (Aves: Apodidae)? A test using cytochrome b...
Swiftlets are small insectivorous birds, many of which nest in caves and are known to echolocate. Due to a lack of distinguishing morphological characters, the...
https://repository.si.edu/items/56d05c37-5cf9-4624-91b6-380670cbd0ba
A New Species of Palm Swift (Tachornis, Apodidae) from the Pleistocene of Puerto-Rico
https://idfg.idaho.gov/species/taxa/1278
Swifts (family Apodidae) | Idaho Fish and Game Species Catalog
idaho fish and gameswiftsfamilyapodidaespecies