Color Key to North American Birds / with bibiographical appendix - Softcover

"[...] Order II. Gulls, Terns, Jaegers, Etc. LONGIPENNES. (3 families, 42 species, 1 subspecies.) Birds generally seen on the wing, as a rule, over water. Bill strong, thick; hooked in the Gulls and Jaegers; sharply pointed in the Terns; often colored in part yellow or red; wings very long, the outer feathers much the[...]".