L. Conrad, J. Krause, I. D. Couzin, and T. J. Roper, "'Leading According to Need' in Self-Organizing Groups," 173:March
GENTLE GIANTS WOO MORE LADIES (IN MICE, ANYWAY)
Sometimes the nice guy gets the girls. At least that's how it is for striped mice. A research team led by Carsten Schradin (University of Zurich and University of the Witwatersrand) studied the breeding strategies of striped mice in South Africa. They found that dominant males who controlled breeding groups had lower testosterone levels than subdominant males. "What is unusual about this society is that the dominant males are in fact the most sociable, often grooming other group members," Schradin says. "It is the smaller and solitary living males, which roam from one group to another, that have the highest testosterone levels." The roaming males try to coerce females to mate, which, as one might imagine, is less successful than establishing a breeding group.
Carsten Schradin, Michael Scantlebury, Neville Pillay, and Barbara Knig, "Testosterone levels in dominant sociable males are lower than in solitary roamers: physiological differences between three male reproductive tactics in a sociably flexible mammal," 173:March
MEERKATS AND THE EVOLUTION OF SPECIALIZED ALARM CALLS
Meerkats' cooperative social structure may have led them to evolve a specialized system of alarm calls, according to an article by Roman Furrer and Marta Manser from the University of Zurich. Meerkats have the ability to vary their alarm calls depending on what type of predator threatens them. In other words, they use one call when threatened from the air by an eagle, and a different call when threatened from the ground by a snake. But Cape groun
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