Become easy birds.
It’s hard to find common goldeneyes, greater scaup, and hooded mergansers in way south Texas. It’s not impossible, but it takes some patience, travel, and looking.
Here, in different habitat, some hard birds get easier. Like:
Common Goldeneyes.
Greater Scaup (and a clark’s grebe).
Hooded Mergansers (with a bufflehead in the background).