Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Timing of daily activity onset (x-axis) in adult European ground squirrels at different seasonal stages (y-axis). Males: filled symbols and solid lines, females: open symbols and broken line. During the pre-mating and mating phases, males are active at earlier times than females, while the opposite pattern occurs during lactation and pre-hibernation. CET, Central European Time. Redrawn after data from Everts et al. [173].
