Bird-Brained? Birds' Personalities Are Correlated With Their Hormone Levels

Any dog or cat owner will agree that animals have personalities but it may come as a surprise to many to learn that birds also do. As an example, individual birds vary in their levels of curiosity, with distinctions being made between “fast” and “slow” explorers. A considerable body of research has examined the differences between fast and slow birds but the levels of stress hormones (glucocorticoids) have not previously been investigated, although these hormones are known to be important in a number of aspects of bird behaviour.

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