Key behaviours / activities to look out for this month are:
New antler grow visible on all non-fawn bucks.
Adult males - which, for much of the year, are solitary - spend time with does and fawns, sometimes forming family groups
A lot of time quietly resting up, between periods of feeding.
Although a buck's testosterone levels are lowest in the winter, they still show hostile tendencies, even though their antlers are in the growth stage.
The new growth causes the deer irritation .
Buck fawns often grow tiny, button antlers, which are shed before the proper pair are grown.
Mist and fog can make the deer even more difficult to find than normal. The good thing is that it does not necessarily make them any more wary, though.
As previously mentioned, dominant males will sometimes seek the company of other roe deer during the winter. Note how the adult's antler development is more advanced than the young buck on the left of the photo.