Bird-brained? Birds' personalities are correlated with their hormone levels

Individuals of Great Tit vary in their levels of curiosity, with distinctions being made between "fast" and "slow" explorers. Mareike Stowe from University of Veterinary Medicine, Vienna has now shown significant differences in the levels of glucocorticoids in fast and slow birds. Her results are published in issue 58 of the journal Hormones and Behavior.

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