Chronotypes, the individual differences in daily activity timing, have profound associations
with numerous physiological processes. Despite this, the covariance between chronotypes …

Research on stress coping style, ie, the response of an organism to adverse conditions,
which is constant over time and context, gained momentum in recent years, to better …

Behavioural variation at the individual level has been shown to play an important role in
animal ecology and evolution. Whereas most studies have focused on subadult or adult …

Virtually all organisms have adapted to the earth's day-night cycles by the evolution of
endogenous rhythms that regulate most biological processes. Recent research has …

Highlights•We explored the relationship between chronotype and aggression in female
great tits.•Females starting activity earlier in the morning had a more aggressive …

Although it is widely acknowledged that animal personality plays a key role in ecology,
current debate focuses on the exact role of personality in mediating life-history trade-offs …

Life history theory predicts a trade‐off between migration and residency where migration is
favoured when it infers elevated fitness. Although migration to more favourable …

Standardization and reduction of variation is key to behavioural screening of animal models
in toxicological and pharmacological studies. However, individual variation in behavioural …

Like many organisms, birds exhibit daily (circadian) and seasonal biological rhythms, and
within populations both daily and seasonal timing often vary among individuals. Because …

Biological clocks play a fundamental role in the physiological and behavioural processes of
organisms. Internal timekeepers evolved to anticipate environmental changes, the most …