Anatidae
- Fulvous Whistling-Duck Dendrocygna bicolor
- White-faced Whistling-Duck Dendrocygna viduata
- Black-bellied Whistling-Duck Dendrocygna autumnalis
- Muscovy Duck Cairina moschata
- American Wigeon Anas americana
- Green-winged Teal Anas crecca Rare/Accidental
- Mallard Anas platyrhynchos Rare/Accidental
- Northern Pintail Anas acuta
- Blue-winged Teal Anas discors
- Cinnamon Teal Anas cyanoptera Rare/Accidental
- Northern Shoveler Anas clypeata
- Ring-necked Duck Aythya collaris
- Greater Scaup Aythya marila Rare/Accidental
- Lesser Scaup Aythya affinis
- Masked Duck Nomonyx dominica
- Ruddy Duck Oxyura jamaicensis Rare/Accidental
Read more about this topic: List Of Birds Of Costa Rica