Color Key to North American Birds / with bibliographical appendix

by Frank M. Chapman

Toes four with lobate webs; tipped with a broad nail; tail wanting.

Family 2. LOONS. GAVIIDÆ.

Toes four, webbed; toe-nails not broad and flat; tail present.

Family 3. AUKS, MURRES, AND PUFFINS. ALCIDÆ.

Toes three, webbed; toe-nails sharp; tail present.

Order II. Gulls, Terns, Jaegers, Etc. LONGIPENNES.

(3 families, 42 species, 1 subspecies.)