Hemiprocnidae: The Treeswifts
Ethan like these fellows more than normal swifts because they actually land sometimes. He has recorded 3 of the 4 Treeswifts.
Hemiprocne comata (Whiskered Treeswift.
Hemiprocne coronata (Crested Treeswift)
Hemiprocne longipennis (Gray-Rumped Treeswift)
The excellent species name refers to the tailfeathers.