"Human beings, fish, reptiles and birds have the same hormones in their blood with very similar functions. But why does one find hormone values in some species that are ten times higher than in others? A team of international scientists headed by Dr. Michaela Hau from the Max Planck Institute for Ornithology in Radolfzell has now discovered that the differing concentrations in birds of the stress hormone, corticosterone, and the reproductive hormone, testosterone, are correlated with the 'pace of life.'"
Living fast and dangerously: Hormones influence the 'pace of life' of songbirds:
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