COMMON TERN.
70. Sterna hirundo. 15 inches.
This bird differs from the above in the red of the bill being more blackish at the tip, and the under parts being a pearly gray in place of white, tail not quite as much forked, and shorter; edge of outer primaries and outer tail-feathers blackish.
Nest.—These breed much more abundantly on the Atlantic coast. Their eggs are more rounded (1.75 × 1.40).
