The birds are hard to observe, as they live in a region of mountainous forest, so the researchers have attached tiny cameras to the tails of some birds, as one method of investigating their behaviour.
The breakthrough for research into intersexual selection came in the development of a new technique for investigating female response in the laboratory.
Recent research has confirmed that in blind subjects who use echolocation to navigate, it is the visual part of the brain that processes the auditory echoes. Christie Nicholson reports.
Recent field studies, however, reveal that on dives in the wild, the seal usually heads directly for its prey and returns to the surface in less than twenty minutes.
James Heckman, the Nobel Prize-winning economist, has examined how the returns on education break down for individuals with different backgrounds and levels of ability.