Well, this was an easy bird family to do, in a way. It was easy because the Cormorant family contains a single bird species found in Montana, the double-crested cormorant, but not so easy because they are not terribly common here and tend to be a bit intolerant of human presence. An additional complication is that there is pretty much no way to pronounce Phalacrocoracidae in English (at least six syllables but possibly as many as eight). Double-crested cormorants dive into lakes, ponds, and rivers to catch fish, crabs, and amphibians, as well as mollusks and plant material. In the spring, males attract females by splashing in the water, swimming in a zig-zag pattern, and presenting her with weeds for her approval. Oh-la-la! Reminds me of some of my youthful dating experiences.
Double-crested cormorant - Phalacrocorax auritus