The quiz bird is Horned Screamer. In the flight shot you can just see the silly little crest as well as a spur on the leading edge of the right wing. To really experience this bird you have to hear them. It never ceases to make one laugh, and it makes a superb ringtone.
Just 8 minutes earlier, also on the Manu River, we paused to get photos and amazing views of these roosting Sand-colored Nighthawks.