In at least one breed of northern seabird, the size of males’ feather crests may be more than simple ornamentation. Crest size may be a physical indicator of a male crested auklet’s quality as a mate.
In at least one breed of northern seabird, the size of males’ feather crests may be more than simple ornamentation. Crest size may be a physical indicator of a male crested auklet’s quality as a mate.