a. The black-faced spoonspills can use their bills to catch fish easily.
a. The black-faced spoonspills can catch fish easily with their bills.
The above are both fine.
b. I want to use my eyes to watch black-faced spoonspills.
This is redundant, you can just say: I want to watch the black-faced spoonspills.
b. I would like to watch black-faced spoons