Angry Giraffe

Lifestyle
While giraffes are usually found in groups, the composition of these groups is more fluid than in other social ungulates. They are a largely transient species with few strong social bonds and aggregations usually disband every few hours, although calving groups can last weeks to months. For research purposes, a "group" has been defined as "a collection of individuals that are less than a kilometre apart and moving in the same general direction." Giraffe groups can range from over 40 individuals to only a few individuals with the latter being more common. Female giraffes associate in groups of a dozen or so members, occasionally including a few younger males. Calves and sub-adults are rarely alone. Giraffe groups with young tend to feed in more open areas, presumably to provide better visibility to detect predators. This may reduce their feeding efficiency.
Reproduction is broadly polygamous, with a few older males impregnating the fertile females. Male giraffes determine female fertility by tasting the female's urine in order to detect estrus, in a multi-step process known as the Flehmen response. Once a estrous female is detected, the male will them attempt to court her. Males prefer younger females, possibly became the latter are more fertile, while females prefer older, more dominant males. During courtship, dominant males will displace subordinates from the presence of the females, by staring and walking towards them. Thus the female prolongs the courtship process for as long as possible so only the most dominant male remains and copulation will follow.
Although generally quiet and non-vocal, giraffes have been heard to communicate with various sounds. Courting males will emit loud coughs. Females will call their young by whistling or bellowing. Calves will bleat, moo, or make mewing sounds. In addition, giraffes will grunt, snort, hiss, or make strange flute-like sounds. Recent research has provided evidence that the giraffes produce infrasound.