Why do giraffes have long necks?
Giraffes' long necks help them reach leaves high in trees that other animals cannot. Males also use their necks in fights over mates, which may have favored longer necks.
The classic explanation is that long necks let giraffes eat leaves from tall acacia trees, avoiding competition with smaller plant-eaters. During dry seasons, this high food supply can be vital.
Male giraffes also fight by swinging their heavy necks and heads at each other, a behavior called necking. Males with longer, heavier necks often win and get more chances to mate, so sexual selection may have helped necks grow longer over time.
Built for height
A giraffe's neck is about 2 meters long but has only seven bones, like ours. Special valves in its blood vessels and a powerful heart help control blood pressure, so a giraffe does not faint when it lifts its head after drinking.
Did You Know?
A 2022 study of a fossil giraffe relative with a thick, helmet-like skull suggested that head-butting competition played a role in the evolution of giraffe necks.