Key behaviours / activities to look out for this month are:
Non-juvenile deer start to become more solitary.
Mature bucks shed their velvet and become aggressive.
Most likely month for weak individuals to die of malnutrition (particularly youngsters) after a severe winter.
Snow can occur during early spring, too. Food supplies will be at their lowest at this time of year, and the deer sometimes have to reach high into the bushes and trees to reach sustenance, in this case ivy.
To conserve energy, much time will be spent chewing the cud to extract nutrients from the tough, fibrous leaves.
This is the time of year when starvation is most likely to occur. Fawns are especially vulnerable, since they carry fewer fat reserves than the adults.
The gradual lengthening of the daylight hours causes the roe deer's tendency to be solitary to re-emerge again in the spring.
And with that, comes the awakening of the spirited nature of the bucks, young and old.
You can see them roaming about their range; more senior males tailing and - eventually - harrying the younger individuals.
A definitive point comes when the antlers are fully grown, and their velvety covering that protected the growing bone since the previous spikes were cast, falls away. At this time, the testosterone are high and increasing, and aggressive behaviour starts again in earnest.