At Martin Mere Wildfowl & Wetland Trust in Lancashire which has birds from all over the world. Quite a few that they don't have at the Washington centre so stuck for some ids.
1 looks like Silver or Puna Teal leaning more toward Puna
3 is a Falcated Teal drake just starting to molt or just getting its feathers back from molting
2 & 4 are the same look to be the same species. I think Marbled Teal
5 my best guess would be Red-billed Teal
wait for conformation from Resin before closing
This message was edited Jul 2, 2012 12:32 PM
#1 is Puna Teal (all-blue bill; Silver has a yellowish bill base)
## 2 & 4 are Crested Duck Lophonetta specularioides (from the Andes in S America; note red eye [dark in Marbled Duck])
#3 agree with Falcated Duck
#5 is an eclipse drake Red-crested Pochard.