Animals in the wild may not have an annual planner to keep track of the year, but they nonetheless manage to keep to a strict calendar—for example knowing just what time of the year to breed and when to hibernate. Research into the circadian clocks that regulate our 24-hour cycles led to a recent Nobel Prize, but very little is known about how animals maintain much longer-term seasonal rhythms.
Click here for original story, A year in the life of the mouse lemur
Source: Phys.org