How Tall Are Giraffes?

How tall are giraffes?

Giraffes are the tallest land animals on Earth. Their height is a critical adaptation that allows them to reach foliage nearly 6 meters (20 feet) above the ground and provides a vantage point for spotting predators.¹²

Height varies by sex:

• Males (bulls): May exceed 5.5 meters (18 feet) in height.¹²
• Females (cows): Typically reach about 4.5 meters (approximately 14.8 feet) in height.¹²

Giraffes reach nearly their full height by four years of age. At birth, a calf is already about 2 meters (6 feet) tall. Their stature is supported by specialized physiological adaptations, including a unique cardiovascular system with thick-walled arteries and valves that help manage blood pressure and counteract gravity when they move their heads.¹²

How does a giraffe’s cardiovascular system handle its height?

To support their extreme height, giraffes have evolved a specialized cardiovascular system designed to manage blood flow against the force of gravity.¹³

Key features of this system include:

• Thick-walled arteries: The arteries in the giraffe’s neck are exceptionally thick-walled to withstand the high pressure required to pump blood vertically to the brain.¹³
• Extra valves: These arteries contain additional valves that help counteract gravity when the giraffe holds its head in an upright position, preventing blood from pooling or flowing backward.³
• Pressure regulation: When a giraffe lowers its head to the ground to drink, special blood vessels located at the base of the brain act as a regulatory mechanism to control blood pressure, preventing damage from the sudden shift in fluid dynamics.³

These adaptations ensure that the giraffe maintains a consistent and efficient supply of oxygenated blood to its brain, regardless of whether it is reaching for high foliage or bending down to the ground.¹³

What is the okapi and how is it related to the giraffe?

The okapi (Okapia johnstoni) is a shy, solitary, and elusive mammal native to the rainforests of the Democratic Republic of the Congo. It is a cud-chewing, hoofed animal that serves as a flagship species for the Ituri Forest.⁴

Relationship to the Giraffe

The okapi is the only living relative of the giraffe, as both are the sole members of the family Giraffidae. While they share a common ancestry within the order Artiodactyla, the two species have evolved distinct physical characteristics adapted to their respective environments:⁴²

• Physical Stature: Unlike the giraffe, which is famous for its extreme height and long neck, the okapi has a relatively short neck and shorter legs.⁴⁵
• Appearance: The okapi features a sleek, deep brown coat with distinctive black-and-white horizontal stripes on its thighs and upper legs, whereas giraffes are known for their irregular brown patches.⁴²
• Habitat: While giraffes are typically found in grasslands and open woodlands, the okapi is restricted to dense, older rainforests.⁴²

Despite these differences, both animals possess long, prehensile tongues used for browsing foliage.⁴²

How do giraffes defend themselves against predators?

Giraffes utilize several strategies to defend themselves and stay safe from predators in the wild:

• Vigilance and Height: Their extreme height serves as a critical vantage point, allowing them to spot potential threats from a great distance. Because they are gregarious animals, they often live in groups, which increases collective vigilance; if one giraffe notices a predator, such as a lion, others in the group will immediately look in that direction.¹²
• Speed: Giraffes are capable of reaching speeds of up to 50 km (31 miles) per hour for several kilometers, and they can attain speeds of 60 km (37 miles) per hour over short distances, helping them outrun threats.²
• Physical Defense: When attacked, particularly by lions or hyenas, a mother giraffe may stand over her calf and kick at the predators using both her front and back legs. These powerful kicks serve as a formidable deterrent against attackers.²