Your chances of seeing clouded leopard and sloth bear on the Asia Trail are far better first thing in the morning.
I haven't had too much issue with crowds at Smithsonian compared to some other zoos. Worst is usually in the Reptile House - it's sort of in the middle of the zoo, but this could be a place to prioritize seeing earlier too.
No, but the map *does* show the paths these exhibits are on. The place this is most important is at the Small Mammal, Ape, and Reptile Houses
@IwishIwasatazoorightnow; there's a path that essentially goes behind all three buildings, and all three have a number of exhibits back there. For example, the Komodo Dragon icon is located where the outdoor back path herp exhibits are.
Last I checked, these are the birds present in Amazonia: Ringed Teal, Green Aracari, Hawk-headed Parrot, Roseate Spoonbill, and Yellow-rumped Cacique. The teal hangs out in the first pool when you walk in the building; the other four hang around in different places but are generally easy to see. There's a flip book of signage for the walk-through room near the exit.