Figure 1.
The roll associated with the plunge dive of a gannet can be considered as either roll direction (to the left or right side of the bird's body) or as the angle of roll from a horizontal position.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.