Published in Biology Letters, a study by German and Polish on Polish crows a forest shows that life in "gangs" of young birds generates more stress than married life they carry into adulthood
By analyzing the feces of young crows in group living in the forest of Bialowieza, Poland, scientists have noted levels of corticosterone, a stress hormone called superior to those seen in adults of the same species nesting pair in that environment.
"In the case of the crows, it is clear that finding food and sharing it is easier when a group of 30 individuals is looking for a carcass, that when only two crows do," explains Dr. Nuria Selva. But the new findings suggest it may be more costly in energy live band that couple to defend a territory and its resources: competition for dominance within the group could cause more stress.
Better pressures experienced during the gang life can lead young crows settle in a relationship, the more stable towards their adult life, so. "Somehow, we believe that there are many similarities with human life: the stressful life of gangs of teenagers compared to a more peaceful life, as a couple," says Dr. Selva.
http://www.maxisciences.com/corbeau/la-vie-de-groupe-des-jeunes-corbeaux-plus-stressante-que-la-vie-de-couple-des adultes_art12446.html-
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