This suggests that birds may be choosing mates based on behavioural compatibility -- a finding that has important implications for conservation of animals that form pair-bonds. "For example, female frogs almost always chose males with deeper voices, and female birds usually prefer males with brighter plumage or longer tails.
This controversy can be summed up as the "good parent" versus "good genes" debate (doi 10.1016/j.cub.2009.08.058) (vertical black arrow; Figure 1): "For example, female frogs almost always chose males with deeper voices, and female birds usually prefer males with brighter plumage or longer tails.
In the Strait of Georgia, large nesting males are associated with deeper waters >40 m, while smaller males are associated with nesting areas in waters 5 to 25 m deep [2].
They play dulcimers, fiddles and percussion and are remarkable for their stirring, atmospheric instrumental work and their rousing vocals, with deep, growled male "throat singing" matched against equally grand female harmonies.
Do males with bigger testicles have deeper voices?
It is a male dominated society with deep-rooted issues of gender including defining roles of men and women.
The two males who were killed were members of families with deep roots in the city's black, religious and civil rights groups.
Companies today must offer unconscious bias sessions with deep dives into gender, race, age, and specifically white male culture.
The paw trade has damaged hunting traditions with deep roots in Siberia, the taxidermist said, turning a hallowed male winter ritual into a mercantile exercise.
With deep political divisions.
